CVE-2026-42585
MEDIUM6.5EPSS 0.01%Netty vulnerable to HTTP Request Smuggling due to malformed Transfer-Encoding
Published: 5/7/2026Modified: 5/19/2026
Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Affected packages (2)
- Debian/nettyfrom 0
- Maven/io.netty:netty-codec-http>= 4.2.0.Alpha1, < 4.2.13.Final
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
References (5)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-42585
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2026-42585
- PATCHhttps://github.com/netty/netty
- WEBhttps://datatracker.ietf.org/doc/html/rfc9112#name-message-body-length
- WEBhttps://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv