CVE-2026-93579Io.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)

Description

A flaw was found in Netty's HTTP/2 stack. This vulnerability allows a remote attacker to inject prohibited characters, such as NUL, Line Feed, and Carriage Return, into HTTP/2 header field values due to insufficient validation. When these values cross an HTTP/2 to HTTP/1.1 translation boundary, they can be exploited for request smuggling, header injection, or response splitting. This could lead to unauthorized access, data manipulation, or other security bypasses.

Timeline

Scores

EPSS (exploitation in 30 days)

1.1% · top 34% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Affected products

• Red Hat · Red Hat Build of Debezium 3.6

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4.17-2 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-29 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-30 – < *

• Red Hat · Red Hat build of Keycloak 26.4.17

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6.8-2 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-24 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-24 – < *

• Red Hat · Red Hat build of Keycloak 26.6.8

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus 3.27.5.SP2

  All versions: unaffected

• Red Hat · Red Hat build of Quarkus 3.33.3.SP2

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform 8.1

  All versions: unaffected

• Red Hat · Red Hat AMQ Broker 7

  All versions: unaffected

• Red Hat · Red Hat build of Apache Camel 4 for Quarkus 3

  All versions: affected

• Red Hat · Red Hat build of Apache Camel for Spring Boot 4

  All versions: affected

• Red Hat · Red Hat build of Apicurio Registry 3

  All versions: affected

• Red Hat · Red Hat Data Grid 8

  All versions: affected

• Red Hat · Red Hat Fuse 7

  All versions: unknown

• Red Hat · Red Hat JBoss Enterprise Application Platform 7

  All versions: unknown

• Red Hat · Red Hat JBoss Enterprise Application Platform 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: affected

• Red Hat · Red Hat Single Sign-On 7

  All versions: unknown

What to do

Workaround: See https://github.com/netty/netty/security/advisories/GHSA-8whp-c7w8-2m72 for fixed versions and remediation guidance.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-83169 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-93579](https://cveledger.app/badge/CVE-2026-93579.svg)](https://cveledger.app/cve/CVE-2026-93579)

Record last updated 6 Nov 2026, 17:32 UTC.