CVE-2026-50020

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.

• CWE-444

• https://github.com/netty/netty/releases/tag/netty-4.1.135.FinalRelease Notes
• https://github.com/netty/netty/releases/tag/netty-4.2.15.FinalRelease Notes
• https://github.com/netty/netty/security/advisories/GHSA-hvcg-qmg6-jm4cVendor Advisory
• https://github.com/netty/netty/security/advisories/GHSA-hvcg-qmg6-jm4cVendor Advisory

Published

Jun 12, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-50014pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm…7.3
• CVE-2026-50015pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm…7.3
• CVE-2026-50016pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm…8.8
• CVE-2026-50017pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm…6.5
• CVE-2026-50019yt-dlp is a command-line audio/video downloader. From 2023.0…7.4
• CVE-2026-5002A vulnerability has been found in PromtEngineer localGPT up …7.3
• CVE-2026-50021pnpm is a package manager. Prior to 10.34.0 and 11.4.0, pnpm…8.1
• CVE-2026-50023yt-dlp is a command-line audio/video downloader. Prior to 20…9.6
• CVE-2026-50026Frappe is a full-stack web application framework. Prior to v…6.9
• CVE-2026-5003A vulnerability was found in PromtEngineer localGPT up to 4d…5.5
• CVE-2026-50030DataEase is an open source data visualization and analysis t…7.1
• CVE-2026-50031ipmi-oem in FreeIPMI before 1.6.18 has exploitable buffer ov…7.5