CVEvulnerability
CVE-2026-40561
5.3 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2026-05-03
- Last modified
- 2026-10-26
- Assigner
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 5.3 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weaknesses
- CWE-444
Description
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence.
Starlet 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
• kazuho starlet (<= 0.31)
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://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch Patch
- https://metacpan.org/release/KAZUHO/Starlet-0.32/changes metacpan.org
- http://www.openwall.com/lists/oss-security/2026/05/03/1 Mailing List, Third Party Advisory