CVE-2025-5987

Libssh: invalid return code for chacha20 poly1305 with openssl backend

Products / packages libssh · Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 10.0 Extended Update Support · 16 more

Published 07/07/2025, 14:24:12 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 03:35:31 UTC

redhat · CVSS:3.1 · 8.1

Assessment vector

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

Severity

high8.1

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

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Source guidance available

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

What this means

Libssh versions before 0.11.2 are affected by a flaw when using the ChaCha20 cipher with the OpenSSL library, potentially leading to undefined behavior. An attacker must exhaust the heap space to trigger this issue. The flaw may compromise data confidentiality and integrity or cause crashes.

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

libssh

1 range

redhat version evidence

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affected

0.10.0 → before 0.11.2

semver versions

Other versions: unaffected

Red Hat · redhat

Red Hat Enterprise Linux 10

1 range

redhat version evidence

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unaffected

0:0.11.1-5.el10_1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10.1

Red Hat · redhat

Red Hat Enterprise Linux 10.0 Extended Update Support

1 range

redhat version evidence

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unaffected

0:0.11.1-4.el10_0.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux_eus:10.0

Red Hat · redhat

Red Hat Enterprise Linux 9

1 range

redhat version evidence

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unaffected

0:0.10.4-17.el9_7 → 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

0:0.10.4-17.el9_7 → 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

0:0.10.4-9.el9_2.2 → 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 Extended Update Support

1 range

redhat version evidence

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unaffected

0:0.10.4-13.el9_4.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_eus:9.4::appstreamcpe:/o:redhat:rhel_eus: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

0:0.10.4-15.el9_6.1 → 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 4.13

1 range

redhat version evidence

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unaffected

413.92.202602240113-0 → 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

redhat version evidence

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unaffected

414.92.202601191325-0 → 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

415.92.202601271320-0 → 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

416.94.202601160124-0 → 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

417.94.202601120213-0 → 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

418.94.202601202224-0 → 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

4.19.9.6.202601260820-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

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

Red Hat · redhat

Red Hat OpenShift Container Platform 4.20

1 range

redhat version evidence

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unaffected

4.20.9.6.202601211057-0 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:openshift:4.20::el9

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

redhat version evidence

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Other versions: unknown

Product identifiers (CPE)

cpe:/o:redhat:rhel_els:6

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges

redhat version evidence

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Other versions: unknown

Product identifiers (CPE)

cpe:/o:redhat:rhel_els:7

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat OpenShift Container Platform 4

0 ranges

redhat version evidence

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Other versions: affected

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.

A workaround for this issue is to disable the chacha20-poly1305@openssh.com cipher in applications using libssh when libssh is compiled with the OpenSSL backend, so the vulnerable ChaCha20-Poly1305 initialization path is not used. Alternatively, upgrade to a version of libssh containing the fix; upstream has released libssh 0.11.2 to correct this defect, and administrators are advised to upgrade or apply the upstream patch as soon as possible.

redhat guidance ↗

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

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the SSH_OK code, resulting in libssh not properly detecting the error returned by the OpenSSL library. This issue can lead to undefined behavior, including compromised data confidentiality and integrity or crashes.

References

17 sources

access.redhat.com/errata/RHSA-2025:23483

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2025:23484

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0427

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0428

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0430

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0431

Vendor advisoryredhat

View 11 more references

access.redhat.com/errata/RHSA-2026:0702

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0978

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0980

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0985

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:0996

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:1539

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:1541

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:3415

Vendor advisoryredhat

access.redhat.com/security/cve/CVE-2025-5987

Security advisoryredhat

bugzilla.redhat.com/show_bug.cgi

Source referenceredhat

www.libssh.org/security/advisories/CVE-2025-5987.txt

Security advisoryredhat

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-2025-5987

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-393 ↗

Return of Wrong Status Code

redhat

Contributing organizations · 2

redhat

Assigning organization

2026-11-05

CISA-ADP

Additional data publisher

2026-02-26

Timeline

All times UTC

7 Jul 2025, 14:24
Advisory published
Publication date supplied by the source.
5 Nov 2026, 16:32
Source updated
Latest modification date supplied by the source.
5 Nov 2026, 21:08
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: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-01-22

Exploitation: none
Automatable: no
Technical Impact: total

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-2025-5987

Enrichment coverage

NVDNot fully checked

GHSANot fully checked

EUVDNot fully checked

EPSSNot fully checked

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