CVE-2026-93566

Io.netty/netty-codec-http: netty: http request smuggling due to control characters in the chunk-size line

Products / packages Red Hat Build of Debezium 3.6 · Red Hat build of Keycloak 26.4 · Red Hat build of Keycloak 26.4.17 · 14 more

Published 18/09/2026, 14:19:29 UTC

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:45:32 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

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

A flaw in Netty allows a remote attacker to exploit HTTP request smuggling by sending a specially crafted request with control characters in the chunk-size line. The vulnerability affects various Red Hat products, including AMQ Broker 7 and AMQ Clients. This can lead to information disclosure or unauthorized actions.

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

Check the exact model, release, and any platform requirements against your installation.

Red Hat · redhat

Red Hat Build of Debezium 3.6

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:debezium:3.6

Red Hat · redhat

Red Hat build of Keycloak 26.4

1 range

redhat version evidence

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unaffected

26.4.17-2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.4::el9

Red Hat · redhat

Red Hat build of Keycloak 26.4

1 range

redhat version evidence

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unaffected

26.4-29 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.4::el9

Red Hat · redhat

Red Hat build of Keycloak 26.4

1 range

redhat version evidence

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unaffected

26.4-30 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.4::el9

Red Hat · redhat

Red Hat build of Keycloak 26.4.17

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.4::el9

Red Hat · redhat

Red Hat build of Keycloak 26.6

1 range

redhat version evidence

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unaffected

26.6.8-2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.6::el9

Red Hat · redhat

Red Hat build of Keycloak 26.6

1 range

redhat version evidence

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unaffected

26.6-24 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.6::el9

Red Hat · redhat

Red Hat build of Keycloak 26.6

1 range

redhat version evidence

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unaffected

26.6-24 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.6::el9

Red Hat · redhat

Red Hat build of Keycloak 26.6.8

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:build_keycloak:26.6::el9

Red Hat · redhat

Red Hat build of Quarkus 3.27.5.SP2

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:quarkus:3.27::el8

Red Hat · redhat

Red Hat build of Quarkus 3.33.3.SP2

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:quarkus:3.33::el8

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 8.1

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/a:redhat:jboss_enterprise_application_platform:8.1

Red Hat · redhat

Red Hat AMQ Broker 7

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:amq_broker:7

Red Hat · redhat

Red Hat AMQ Clients

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:amq_clients:2023

Red Hat · redhat

Red Hat build of Apache Camel 4 for Quarkus 3

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:camel_quarkus:3

Red Hat · redhat

Red Hat build of Apache Camel for Spring Boot 4

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:camel_spring_boot:4

Red Hat · redhat

Red Hat build of Apicurio Registry 3

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:apicurio_registry:3

Red Hat · redhat

Red Hat Data Grid 8

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:jboss_data_grid:8

Red Hat · redhat

Red Hat Fuse 7

0 ranges

redhat version evidence

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Other versions: unknown

Product identifiers (CPE)

cpe:/a:redhat:jboss_fuse:7

Red Hat · redhat

Red Hat JBoss Enterprise Application Platform 7

0 ranges

redhat version evidence

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Other versions: unknown

Product identifiers (CPE)

cpe:/a:redhat:jboss_enterprise_application_platform:7

Red Hat · redhat

Red Hat Single Sign-On 7

0 ranges

redhat version evidence

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Other versions: unknown

Product identifiers (CPE)

cpe:/a:redhat:red_hat_single_sign_on:7

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.

See https://github.com/netty/netty/security/advisories/GHSA-rq4j-fc47-9698 for fixed versions and remediation guidance.

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 Netty. A remote attacker could exploit this by sending a specially crafted HTTP request that includes control characters within the chunk-size line. This bypasses the intended strict validation, allowing the attacker to inject arbitrary HTTP requests. This vulnerability can lead to HTTP request smuggling, potentially resulting in information disclosure or other unauthorized actions.

References

10 sources

access.redhat.com/errata/RHSA-2026:69440

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:69470

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:83612

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:95759

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:95760

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:95761

Vendor advisoryredhat

View 4 more references

access.redhat.com/errata/RHSA-2026:95762

Vendor advisoryredhat

access.redhat.com/errata/RHSA-2026:95887

Vendor advisoryredhat

access.redhat.com/security/cve/CVE-2026-93566

Security advisoryredhat

bugzilla.redhat.com/show_bug.cgi

Source referenceredhat

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-2026-93566

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-1035 ↗

CWE-1035

redhat

Contributing organizations · 2

redhat

Assigning organization

2026-11-06

CISA-ADP

Additional data publisher

2026-09-22

Timeline

All times UTC

18 Sept 2026, 14:19
Advisory published
Publication date supplied by the source.
6 Nov 2026, 17:27
Source updated
Latest modification date supplied by the source.
6 Nov 2026, 17:57
Last imported by cve.new
Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes

CVE · CVE-2026-935662026-11-06

Observed 2026-11-06T17:57:28.112Z · upstream updated 2026-11-06T17:27:28.560Z

Product or version evidence changed

before

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after

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  },
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      "cpe:/a:redhat:camel_quarkus:3"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat build of Apache Camel for Spring Boot 4",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:camel_spring_boot:4"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat build of Apicurio Registry 3",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:apicurio_registry:3"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Data Grid 8",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:jboss_data_grid:8"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Fuse 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unknown",
    "cpes": [
      "cpe:/a:redhat:jboss_fuse:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat JBoss Enterprise Application Platform 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unknown",
    "cpes": [
      "cpe:/a:redhat:jboss_enterprise_application_platform:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Single Sign-On 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unknown",
    "cpes": [
      "cpe:/a:redhat:red_hat_single_sign_on:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-93566"
  }
]

References changed

before

[
  "https://access.redhat.com/errata/RHSA-2026:69440",
  "https://access.redhat.com/errata/RHSA-2026:69470",
  "https://access.redhat.com/errata/RHSA-2026:83612",
  "https://access.redhat.com/errata/RHSA-2026:95760",
  "https://access.redhat.com/errata/RHSA-2026:95761",
  "https://access.redhat.com/security/cve/CVE-2026-93566",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2536954"
]

after

[
  "https://access.redhat.com/errata/RHSA-2026:69440",
  "https://access.redhat.com/errata/RHSA-2026:69470",
  "https://access.redhat.com/errata/RHSA-2026:83612",
  "https://access.redhat.com/errata/RHSA-2026:95759",
  "https://access.redhat.com/errata/RHSA-2026:95760",
  "https://access.redhat.com/errata/RHSA-2026:95761",
  "https://access.redhat.com/errata/RHSA-2026:95762",
  "https://access.redhat.com/errata/RHSA-2026:95887",
  "https://access.redhat.com/security/cve/CVE-2026-93566",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2536954"
]

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

Showing up to 50 most recent observed changes.

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: 0.48% estimated probability in the next 30 days. 2026-11-05 · FIRST EPSS.

CISA-ADP · SSVC

CISA Coordinator · 2026-09-22

Exploitation: none
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

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CVE CVE-2026-93566