CVE-2026-93574Io.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsing

Description

A flaw was found in Netty's `netty-codec-http` component. A remote attacker could exploit this vulnerability by sending a specially crafted HTTP/1.1 chunk-size token that includes post-digit whitespace. This incorrect parsing of the chunk size can lead to HTTP request smuggling. This allows an attacker to bypass security controls or access unauthorized resources in proxy/backend deployments.

Timeline

Scores

EPSS (exploitation in 30 days)

1.7% · top 23% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · 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: affected

• Red Hat · Red Hat AMQ Clients

  All versions: affected

• 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 Single Sign-On 7

  All versions: unknown

What to do

Workaround: See https://github.com/netty/netty/security/advisories/GHSA-j4mg-hqgv-34qc 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-2026-83385 (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-2026-93574](https://cveledger.app/badge/CVE-2026-93574.svg)](https://cveledger.app/cve/CVE-2026-93574)

Record last updated 6 Nov 2026, 17:27 UTC.