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CVE-2026-40561

5.3 medium SSVC exploitation: none Modified
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 5.3 · kazuhoNVD modified 2026-10-26 20:10

Affected (CPE criteria) 1

  • cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:*

References 4