{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40561", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-04-14T11:35:53.644Z", "datePublished": "2026-05-03T00:57:31.519Z", "dateUpdated": "2026-05-03T03:04:55.098Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Starlet", "product": "Starlet", "programFiles": ["lib/Starlet/Server.pm"], "programRoutines": [{"name": "Starlet::Server::handle_connection"}], "repo": "https://github.com/kazuho/Starlet", "vendor": "KAZUHO", "versions": [{"lessThanOrEqual": "0.31", "status": "affected", "version": "0", "versionType": "custom"}]}], "credits": [{"lang": "en", "type": "finder", "value": "CPANSec"}], "descriptions": [{"lang": "en", "value": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nStarlet 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."}], "impacts": [{"capecId": "CAPEC-33", "descriptions": [{"lang": "en", "value": "CAPEC-33 HTTP Request Smuggling"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-444", "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-05-03T00:57:31.519Z"}, "references": [{"url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"}, {"tags": ["patch"], "url": "https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch"}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2026-04-12T00:00:00.000Z", "value": "Issue identified"}, {"lang": "en", "time": "2026-04-28T00:00:00.000Z", "value": "Maintainer notified"}, {"lang": "en", "time": "2026-05-02T00:00:00.000Z", "value": "Determined that the issue was already public on GitHub"}], "title": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence", "workarounds": [{"lang": "en", "value": "Migrate to Starman 0.4018 or later which has fixed this issue or apply the patch."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/05/03/1"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-05-03T03:04:55.098Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "Starlet versions through 0.31 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nStarlet 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."}], "id": "CVE-2026-40561", "lastModified": "2026-05-03T05:15:58.487", "metrics": {}, "published": "2026-05-03T01:15:58.390", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.openwall.com/lists/oss-security/2026/05/03/1"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

{"created": "2026-05-03T02:30:05.816471+00:00", "updated": "2026-05-03T02:30:05.816499+00:00", "vendors": []}