{"id":"CVE-2026-40560","state":"PUBLISHED","title":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence","description":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nStarman 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.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.","publishedAt":"2026-04-28T23:46:37.780Z","updatedAt":"2026-04-29T19:06:02.932Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","source":"CISA-ADP"},"assigner":"CPANSec","products":["MIYAGAWA Starman"],"affected":[{"vendor":"MIYAGAWA","product":"Starman","packageName":"Starman","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.4018","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/Starman/Server.pm"],"programRoutines":[{"name":"Starman::Server::_prepare_env"}],"repo":"https://github.com/miyagawa/Starman"}],"references":["https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch","https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes","https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3","http://www.openwall.com/lists/oss-security/2026/04/29/1"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40560.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40560","state":"PUBLISHED","datePublished":"2026-04-28T23:46:37.780Z","dateUpdated":"2026-04-29T19:06:02.932Z","assignerShortName":"CPANSec","assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateReserved":"2026-04-14T11:35:53.644Z"},"containers":{"cna":{"title":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence","descriptions":[{"lang":"en","value":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nStarman 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.\n\nAn attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy."}],"affected":[{"vendor":"MIYAGAWA","product":"Starman","packageName":"Starman","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"0.4018","versionType":"custom"}],"collectionURL":"https://cpan.org/modules","programFiles":["lib/Starman/Server.pm"],"programRoutines":[{"name":"Starman::Server::_prepare_env"}],"repo":"https://github.com/miyagawa/Starman"}],"references":[{"url":"https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch","tags":["patch"]},{"url":"https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes","tags":["release-notes"]},{"url":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","description":"CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"CPANSec","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","dateUpdated":"2026-04-29T19:06:02.932Z"},"credits":[{"lang":"en","type":"finder","value":"CPANSec"}],"impacts":[{"capecId":"CAPEC-33","descriptions":[{"lang":"en","value":"CAPEC-33 HTTP Request Smuggling"}]}],"solutions":[{"lang":"en","value":"Upgrade to version 0.4018"}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-04-12T00:00:00.000Z","value":"Issue identified by CPANSec"},{"lang":"en","time":"2026-04-27T00:00:00.000Z","value":"Issue reported to software maintainer"},{"lang":"en","time":"2026-04-27T00:00:00.000Z","value":"Fix committed to public Github repository"},{"lang":"en","time":"2026-04-27T00:00:00.000Z","value":"Updated version uploaded to CPAN"}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}},"adp":[{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/04/29/1"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-04-29T03:04:48.511Z"}},{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.5,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"NONE","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-04-29T13:30:17.148319Z","id":"CVE-2026-40560","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-29T13:30:33.198Z"}}]}}}