{"api_version":"1","generated_at":"2026-05-13T08:50:25+00:00","cve":"CVE-2026-40562","urls":{"html":"https://cve.report/CVE-2026-40562","api":"https://cve.report/api/cve/CVE-2026-40562.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-40562","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-40562"},"summary":{"title":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence","description":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle 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.","state":"PUBLISHED","assigner":"CPANSec","published_at":"2026-05-06 13:16:09","updated_at":"2026-05-11 15:04:24"},"problem_types":["CWE-444","CWE-444 CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"],"metrics":[{"version":"3.1","source":"ADP","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","data":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}},{"version":"3.1","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"}}],"references":[{"url":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3","name":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":["Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch","name":"https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":["Patch"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes","name":"https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes","refsource":"9b29abf9-4ab0-4765-b253-1875cd9b441e","tags":["Release Notes"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"http://www.openwall.com/lists/oss-security/2026/05/06/7","name":"http://www.openwall.com/lists/oss-security/2026/05/06/7","refsource":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40562","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40562","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"KAZEBURO","product":"Gazelle","version":"affected 0.49 custom","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-04-12T00:00:00.000Z","lang":"en","value":"Issue identified by CPANSec"},{"source":"CNA","time":"2026-04-29T00:00:00.000Z","lang":"en","value":"Issue reported to software maintainer"},{"source":"CNA","time":"2026-05-06T00:00:00.000Z","lang":"en","value":"Issue disclosed by CPANSec"},{"source":"CNA","time":"2026-05-07T00:00:00.000Z","lang":"en","value":"Gazelle 0.50 released"}],"solutions":[{"source":"CNA","title":"","value":"Upgrade to Gazelle 0.50 or later.","time":"","lang":"en"}],"workarounds":[{"source":"CNA","title":"","value":"Migrate to Starman version 0.4018 or newer which has fixed the issue.  Or apply the patch.","time":"","lang":"en"}],"exploits":[],"credits":[{"source":"CNA","value":"CPANSec","lang":"en"}],"nvd_cpes":[{"cve_year":"2026","cve_id":"40562","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"kazeburo","cpe5":"gazelle","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"perl","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"40562","cve":"CVE-2026-40562","epss":"0.000380000","percentile":"0.113870000","score_date":"2026-05-12","updated_at":"2026-05-13 00:11:53"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"adp":[{"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}},{"other":{"content":{"id":"CVE-2026-40562","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","timestamp":"2026-05-06T14:14:25.637199Z","version":"2.0.3"},"type":"ssvc"}}],"providerMetadata":{"dateUpdated":"2026-05-06T14:15:32.815Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"title":"CISA ADP Vulnrichment"},{"providerMetadata":{"dateUpdated":"2026-05-06T16:32:45.619Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"url":"http://www.openwall.com/lists/oss-security/2026/05/06/7"}],"title":"CVE Program Container"}],"cna":{"affected":[{"collectionURL":"https://cpan.org/modules","defaultStatus":"unaffected","packageName":"Gazelle","product":"Gazelle","programFiles":["lib/Plack/Handler/Gazelle.pm","lib/Plack/Handler/Gazelle.xs"],"programRoutines":[{"name":"Plack::Handler::Gazelle::run"},{"name":"lib/Plack/Handler/Gazelle.xs::_parse_http_request"}],"repo":"https://github.com/kazeburo/Gazelle","vendor":"KAZEBURO","versions":[{"lessThanOrEqual":"0.49","status":"affected","version":"0","versionType":"custom"}]}],"credits":[{"lang":"en","type":"finder","value":"CPANSec"}],"descriptions":[{"lang":"en","value":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle 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":{"dateUpdated":"2026-05-07T16:13:49.501Z","orgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","shortName":"CPANSec"},"references":[{"url":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3"},{"tags":["patch"],"url":"https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch"},{"tags":["release-notes"],"url":"https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes"}],"solutions":[{"lang":"en","value":"Upgrade to Gazelle 0.50 or later."}],"source":{"discovery":"UNKNOWN"},"timeline":[{"lang":"en","time":"2026-04-12T00:00:00.000Z","value":"Issue identified by CPANSec"},{"lang":"en","time":"2026-04-29T00:00:00.000Z","value":"Issue reported to software maintainer"},{"lang":"en","time":"2026-05-06T00:00:00.000Z","value":"Issue disclosed by CPANSec"},{"lang":"en","time":"2026-05-07T00:00:00.000Z","value":"Gazelle 0.50 released"}],"title":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence","workarounds":[{"lang":"en","value":"Migrate to Starman version 0.4018 or newer which has fixed the issue.  Or apply the patch."}],"x_generator":{"engine":"cpansec-cna-tool 0.1"}}},"cveMetadata":{"assignerOrgId":"9b29abf9-4ab0-4765-b253-1875cd9b441e","assignerShortName":"CPANSec","cveId":"CVE-2026-40562","datePublished":"2026-05-06T12:36:34.715Z","dateReserved":"2026-04-14T11:35:53.644Z","dateUpdated":"2026-05-07T16:13:49.501Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-06 13:16:09","lastModifiedDate":"2026-05-11 15:04:24","problem_types":["CWE-444","CWE-444 CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:kazeburo:gazelle:*:*:*:*:*:perl:*:*","versionEndExcluding":"0.50","matchCriteriaId":"F2360CF4-CAB8-4DC7-B595-C7501D7EC17C"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"40562","Ordinal":"1","Title":"Gazelle versions through 0.49 for Perl allows HTTP Request Smugg","CVE":"CVE-2026-40562","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"40562","Ordinal":"1","NoteData":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header Precedence.\n\nGazelle 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.","Type":"Description","Title":"Gazelle versions through 0.49 for Perl allows HTTP Request Smugg"}]}}}