CVE-2026-3833

Gnutls: gnutls: policy bypass due to case-sensitive nameconstraints comparison

Products / packages gnutls · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 10.0 Extended Update Support · 29 more

Published 30/04/2026, 17:37:05 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 03:00:33 UTC

redhat · CVSS:3.1 · 6.5

Assessment vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Severity

medium6.5

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Exploit reference published

Source-linked evidence; not proof of attacks in the wild or independent validation.

Remediation

Source guidance available

Review the recorded instructions. Guidance may be a workaround rather than a fixed version.

What this means

A flaw in gnutls allows a remote attacker to bypass policy by crafting a leaf certificate with casing differences in the Subject Alternative Name, affecting versions less than 3.8.13. This could result in unauthorized access or information disclosure.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

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Vendor not supplied · redhat

gnutls

1 range

redhat version evidence

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affected

0 → before 3.8.13

semver versions

Other versions: unaffected

Red Hat · redhat

Red Hat Enterprise Linux 10

1 range

redhat version evidence

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unaffected

0:3.8.10-4.el10_2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10.2

Red Hat · redhat

Red Hat Enterprise Linux 10.0 Extended Update Support

1 range

redhat version evidence

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unaffected

0:3.8.9-9.el10_0.19 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux_eus:10.0

Red Hat · redhat

Red Hat Enterprise Linux 7 Extended Lifecycle Support

1 range

redhat version evidence

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unaffected

0:3.3.29-9.el7_9.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:rhel_els:7

Red Hat · redhat

Red Hat Enterprise Linux 8

1 range

redhat version evidence

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unaffected

0:3.6.16-8.el8_10.6 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:8::appstreamcpe:/o:redhat:enterprise_linux:8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8

1 range

redhat version evidence

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unaffected

0:3.6.16-8.el8_10.6 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:8::appstreamcpe:/o:redhat:enterprise_linux:8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

1 range

redhat version evidence

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unaffected

0:3.6.14-10.el8_4.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.4::appstreamcpe:/a:redhat:rhel_eus_long_life:8.4::appstreamcpe:/o:redhat:rhel_aus:8.4::baseoscpe:/o:redhat:rhel_eus_long_life:8.4::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

1 range

redhat version evidence

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unaffected

0:4.13-3.el8_4.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.4::appstreamcpe:/a:redhat:rhel_eus_long_life:8.4::appstreamcpe:/o:redhat:rhel_aus:8.4::baseoscpe:/o:redhat:rhel_eus_long_life:8.4::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

1 range

redhat version evidence

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unaffected

0:3.6.14-10.el8_4.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.4::appstreamcpe:/a:redhat:rhel_eus_long_life:8.4::appstreamcpe:/o:redhat:rhel_aus:8.4::baseoscpe:/o:redhat:rhel_eus_long_life:8.4::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

1 range

redhat version evidence

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unaffected

0:4.13-3.el8_4.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.4::appstreamcpe:/a:redhat:rhel_eus_long_life:8.4::appstreamcpe:/o:redhat:rhel_aus:8.4::baseoscpe:/o:redhat:rhel_eus_long_life:8.4::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

1 range

redhat version evidence

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unaffected

0:3.6.16-5.el8_6.5 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstreamcpe:/o:redhat:rhel_aus:8.6::baseoscpe:/o:redhat:rhel_eus_long_life:8.6::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

1 range

redhat version evidence

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unaffected

0:4.13-3.el8_6.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstreamcpe:/o:redhat:rhel_aus:8.6::baseoscpe:/o:redhat:rhel_eus_long_life:8.6::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

1 range

redhat version evidence

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unaffected

0:3.6.16-5.el8_6.5 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstreamcpe:/o:redhat:rhel_aus:8.6::baseoscpe:/o:redhat:rhel_eus_long_life:8.6::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

1 range

redhat version evidence

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unaffected

0:4.13-3.el8_6.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstreamcpe:/o:redhat:rhel_aus:8.6::baseoscpe:/o:redhat:rhel_eus_long_life:8.6::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

1 range

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unaffected

0:3.6.16-7.el8_8.4 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstreamcpe:/o:redhat:rhel_e4s:8.8::baseoscpe:/o:redhat:rhel_tus:8.8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

1 range

redhat version evidence

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unaffected

0:4.13-4.el8_8.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstreamcpe:/o:redhat:rhel_e4s:8.8::baseoscpe:/o:redhat:rhel_tus:8.8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:3.6.16-7.el8_8.4 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstreamcpe:/o:redhat:rhel_e4s:8.8::baseoscpe:/o:redhat:rhel_tus:8.8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:4.13-4.el8_8.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstreamcpe:/o:redhat:rhel_e4s:8.8::baseoscpe:/o:redhat:rhel_tus:8.8::baseos

Red Hat · redhat

Red Hat Enterprise Linux 9

1 range

redhat version evidence

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unaffected

0:3.8.10-4.el9_8 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9::appstreamcpe:/o:redhat:enterprise_linux:9::baseos

Red Hat · redhat

Red Hat Enterprise Linux 9

1 range

redhat version evidence

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unaffected

0:3.8.10-4.el9_8 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9::appstreamcpe:/o:redhat:enterprise_linux:9::baseos

Red Hat · redhat

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:3.7.6-21.el9_2.7 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:9.2::appstreamcpe:/o:redhat:rhel_e4s:9.2::baseos

Red Hat · redhat

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:3.8.3-4.el9_4.6 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:9.4::appstreamcpe:/o:redhat:rhel_e4s:9.4::baseos

Red Hat · redhat

Red Hat Enterprise Linux 9.6 Extended Update Support

1 range

redhat version evidence

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unaffected

0:3.8.3-6.el9_6.4 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_eus:9.6::appstreamcpe:/o:redhat:rhel_eus:9.6::baseos

Red Hat · redhat

Red Hat OpenShift Container Platform 4.12

1 range

redhat version evidence

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unaffected

412.86.202608241157-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.12::el8

Red Hat · redhat

Red Hat OpenShift Container Platform 4.13

1 range

redhat version evidence

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unaffected

413.92.202609080414-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.13::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.14

1 range

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unaffected

414.92.202609011250-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.14::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.15

1 range

redhat version evidence

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unaffected

415.92.202609140326-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.15::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.16

1 range

redhat version evidence

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unaffected

416.94.202609011112-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.16::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.17

1 range

redhat version evidence

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unaffected

417.94.202608250221-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.17::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.18

1 range

redhat version evidence

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unaffected

418.94.202609031320-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.18::el9

Red Hat · redhat

Red Hat OpenShift Container Platform 4.19

1 range

redhat version evidence

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unaffected

4.19.9.6.202608182320-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.19::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.17

1 range

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unaffected

1791371080 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.17::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.17

1 range

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unaffected

1791371069 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.17::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.17

1 range

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unaffected

1791788287 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.17::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.17

1 range

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unaffected

1791970484 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.17::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.18

1 range

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unaffected

1791459707 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.18::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.18

1 range

redhat version evidence

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unaffected

1791459711 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.18::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.18

1 range

redhat version evidence

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unaffected

1791459759 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.18::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.18

1 range

redhat version evidence

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unaffected

1789029076 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.18::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.18

1 range

redhat version evidence

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unaffected

1791966259 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.18::el9

Red Hat · redhat

Cert Manager support for Red Hat OpenShift release 1.20

1 range

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unaffected

1790598593 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:cert_manager:1.20::el9

Red Hat · redhat

Red Hat Discovery 2

1 range

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unaffected

1782159791 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:discovery:2::el9

Red Hat · redhat

Red Hat Discovery 2

1 range

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unaffected

1782166952 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:discovery:2::el9

Red Hat · redhat

Red Hat Hardened Images

1 range

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unaffected

3.8.13-1.hum1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:hummingbird:1

Red Hat · redhat

Red Hat OpenShift AI 3.4

1 range

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unaffected

1790703542 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift_ai:3.4::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1781525684 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1781525671 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1781525693 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1781525739 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1787241211 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1787135742 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

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unaffected

1787241260 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

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Other versions: unaffected

Product identifiers (CPE)

cpe:/o:redhat:rhel_els:6

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

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Other versions: unknown

Product identifiers (CPE)

cpe:/a:redhat:openshift:4

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

redhat guidance ↗

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

The sources identify public exploit references. We have not independently tested them; their availability does not establish exploitation in the wild.

gitlab.com/gnutls/gnutls/-/issues/1803 ↗Attributed to CISA-ADP

Original source description

Read the full publisher description

A flaw was found in gnutls. This vulnerability occurs because gnutls performs case-sensitive comparisons of nameConstraints labels, specifically for dNSName (DNS) or rfc822Name (email) constraints within excludedSubtrees or permittedSubtrees. A remote attacker can exploit this by crafting a leaf certificate with casing differences in the Subject Alternative Name (SAN), leading to a policy bypass where a certificate that should be rejected is instead accepted. This could result in unauthorized access or information disclosure.

References

35 sources

access.redhat.com/errata/RHSA-2026:13274

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:20611

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:20612

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:20613

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:26319

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:26409

Vendor advisoryredhat

View 29 more references

access.redhat.com/errata/RHSA-2026:29197

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:30004

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:30849

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:30850

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:32962

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:33125

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:41921

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:43575

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:57402

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:58981

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:59831

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:60019

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:62409

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:62549

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:65839

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:65851

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:67857

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:72502

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:74674

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82304

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82322

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82347

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82354

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82372

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82857

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:82888

Vendor advisoryredhat

access.redhat.com/security/cve/CVE-2026-3833

Security advisoryredhat

bugzilla.redhat.com/show_bug.cgi

Source referenceredhat

gitlab.com/gnutls/gnutls/-/issues/1803

Public exploit referenceredhat · CISA-ADP

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-3833

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-178 ↗

Improper Handling of Case Sensitivity

redhat

Contributing organizations · 2

redhat

Assigning organization

2026-11-05

CISA-ADP

Additional data publisher

2026-04-30

Timeline

All times UTC

30 Apr 2026, 17:37
Advisory published
Publication date supplied by the source.
5 Nov 2026, 21:22
Source updated
Latest modification date supplied by the source.
5 Nov 2026, 23:18
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: 0.56% estimated probability in the next 30 days. 2026-11-09 · FIRST EPSS.

CISA-ADP · SSVC

CISA Coordinator · 2026-04-30

Exploitation: poc
Automatable: yes
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record identifiers

Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-3833