starlet: Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence
CVE-2026-40561 is fixed in starlet on 1 platform, first by DEBIAN-CVE-2026-40561, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| starlet · Debian 13.5 (trixie) | 0.31-2+deb13u1 | DEBIAN-CVE-2026-40561 | May 15, 2026 |
| starlet · Debian 14 | 0.31-3 | DEBIAN-CVE-2026-40561 | May 15, 2026 |
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