CVE-2026-40561
Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
1th
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.
| CWE | CWE-444 |
| Vendor | kazuho |
| Product | starlet |
| Published | May 3, 2026 |
| Last Updated | May 7, 2026 |
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Affected Versions
KAZUHO / Starlet
0 ≤ 0.31
References
datatracker.ietf.org: https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3 github.com: https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch metacpan.org: https://metacpan.org/release/KAZUHO/Starlet-0.32/changes openwall.com: http://www.openwall.com/lists/oss-security/2026/05/03/1
Credits
CPANSec