{"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": "2026-05-07T16:45:01.655Z"}, "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": "2026-05-07T16:45:01.655Z"}, "references": [{"url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"}, {"tags": ["patch"], "url": "https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/KAZUHO/Starlet-0.32/changes"}], "solutions": [{"lang": "en", "value": "Upgrade to Starlet 0.32 or later."}], "source": {"discovery": "UNKNOWN"}, "timeline": [{"lang": "en", "time": "2019-11-19T00:00:00.000Z", "value": "Patch submitted to Starlet 0.31"}, {"lang": "en", "time": "2026-04-12T00:00:00.000Z", "value": "Issue identified by CPANSec"}, {"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"}, {"lang": "en", "time": "2026-05-06T00:00:00.000Z", "value": "Starlet 0.32 released with a fix"}], "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"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.3, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-05-04T13:54:42.679845Z", "id": "CVE-2026-40561", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-05-04T13:54:47.941Z"}}]}}

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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:kazuho:starlet:*:*:*:*:*:perl:*:*", "matchCriteriaId": "D7E737B0-BC8D-4FDA-A6B2-E36FC466209A", "versionEndIncluding": "0.31", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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": "2026-05-07T17:15:58.750", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-05-03T01:15:58.390", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Third Party Advisory"], "url": "https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Patch"], "url": "https://github.com/kazuho/Starlet/commit/a7d5dfd1862aafa43e5eaca0fdb6acf4cc15b2d0.patch"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "url": "https://metacpan.org/release/KAZUHO/Starlet-0.32/changes"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/05/03/1"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{}

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