CVE-2026-89044
mediumNetty 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-En…
Vendor / product: Netty — netty
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/netty/netty disclosure@vulncheck.com
- https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/... disclosure@vulncheck.com
- https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c disclosure@vulncheck.com
- https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585 disclosure@vulncheck.com
- https://github.com/netty/netty/releases/tag/netty-4.1.138.Final disclosure@vulncheck.com
- https://github.com/netty/netty/releases/tag/netty-4.2.18.Final disclosure@vulncheck.com
- https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-... disclosure@vulncheck.com