CVE-2026-50020

Description

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, before reading the first request-line, `HttpObjectDecoder` skips every byte for which `Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace. RFC 9112 §2.2 only asks servers to ignore empty CRLF lines preceding the request-line — a carefully scoped robustness allowance intended to handle HTTP/1.0 POST workarounds. Silently absorbing NUL bytes, SOH, STX, and other non-CRLF control characters goes significantly beyond this, and can be exploited for request-boundary confusion in pipelined or multiplexed transports where a front-end component treats those bytes differently. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

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Produits concernés

• netty
• Netty netty

Scores CVSS

Faiblesses (CWE)

• CWE-444

Références

• https://github.com/netty/netty/releases/tag/netty-4.1.135.Final Release Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.15.Final Release Notes
• https://github.com/netty/netty/security/advisories/GHSA-hvcg-qmg6-jm4c Vendor Advisory
• https://github.com/netty/netty/security/advisories/GHSA-hvcg-qmg6-jm4c Vendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories