CVE-2026-89044
Dashboard / Vulnerabilities / CVE-2026-89044
Summary: 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
Details: 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.
References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89044.json, 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://nvd.nist.gov/vuln/detail/CVE-2026-89044, https://repo1.maven.org/maven2/io/netty/netty-codec-http/, 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
Affected packages
Package
Name:
Purl:
Affected ranges
Type: GIT
Events:
