CVEvulnerability
CVE-2026-40562
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-05-06
- Last modified
- 2026-10-26
- Assigner
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- Weaknesses
- CWE-444
Description
Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.
Gazelle incorrectly prioritizes "Content-Length" over "Transfer-Encoding: chunked" when both headers are present in an HTTP request. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.
An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.
Affected configurations
• kazeburo gazelle (< 0.50)
Related
Weakness · CWE (1)
- CWE-444 Inconsistent Interpretation of HTTP Requests weakness
References
- https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 Third Party Advisory
- https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes Release Notes
- https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch Patch
- http://www.openwall.com/lists/oss-security/2026/05/06/7 Mailing List, Third Party Advisory