Bug#1135584: starlet: CVE-2026-40561

[Salvatore Bonaccorso]

Source: starlet
Version: 0.31-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for starlet.

CVE-2026-40561[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-40561
    https://www.cve.org/CVERecord?id=CVE-2026-40561
[1[ https://lists.security.metacpan.org/cve-announce/msg/39593408/

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore