CVE-2026-93574

Summary

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.

Affected Software

Weaknesses

• CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Workarounds

See https://github.com/netty/netty/security/advisories/GHSA-j4mg-hqgv-34qc for fixed versions and remediation guidance.

References

• https://access.redhat.com/security/cve/CVE-2026-93574
• https://bugzilla.redhat.com/show_bug.cgi?id=2536966

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