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Medium severity5.3NVD Advisory· Published Jun 12, 2026· Updated Jun 15, 2026

CVE-2026-50020

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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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-httpMaven
>= 4.2.0.Final, < 4.2.15.Final4.2.15.Final
io.netty:netty-codec-httpMaven
< 4.1.135.Final4.1.135.Final

Affected products

113

Patches

Vulnerability mechanics

References

5

News mentions

0

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