CVE-2026-42581 (GCVE-0-2026-42581)

Vulnerability from cvelistv5 – Published: 2026-05-13 17:54 – Updated: 2026-06-30 12:08
VLAI?
Title
Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
Summary
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, HttpObjectDecoder strips a conflicting Content-Length header when a request carries both Transfer-Encoding: chunked and Content-Length, but only for HTTP/1.1 messages. The guard is absent for HTTP/1.0. An attacker that sends an HTTP/1.0 request with both headers causes Netty to decode the body as chunked while leaving Content-Length intact in the forwarded HttpMessage. Any downstream proxy or handler that trusts Content-Length over Transfer-Encoding will disagree on message boundaries, enabling request smuggling. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Severity ?
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version
netty netty Affected: >= 4.2.0.Alpha1, < 4.2.13.Final
Affected: < 4.1.133.Final
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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