CVE-2026-89044

Sažetak

Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.

Reference

https://github.com/netty/netty
https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866
https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c
https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585
https://github.com/netty/netty/releases/tag/netty-4.1.138.Final
https://github.com/netty/netty/releases/tag/netty-4.2.18.Final
https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c
https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding

CVSS

Base:	6.5
Impact:	2.5
Exploitability:	3.9

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	NONE

Impact

Povjerljivost	Cjelovitost	Dostupnost
LOW	LOW	NONE

CVSS vektor

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Zadnje važnije ažuriranje

10-09-2026 - 19:54

Objavljeno

10-09-2026 - 18:18