{"id":"CVE-2026-40562","aliases":["EUVD-2026-27825","GHSA-mjw2-gf6p-382h","MGASA-2026-0130"],"status":"published","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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00319,"percentile":0.2518,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-05-06T12:36:34Z","modified":"2026-10-28T02:31:09Z","fixes":[{"ecosystem":"Mageia:9","package":"perl-Gazelle","fixed_in":["0.490.0-5.1.mga9"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Mageia:9","package":"perl-Gazelle","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.490.0-5.1.mga9"}]}]}],"products":[{"vendor":"kazeburo","product":"gazelle"},{"vendor":"whatcd","product":"gazelle"}],"references":[{"url":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3","tags":["Third Party Advisory","web"]},{"url":"https://security.metacpan.org/patches/G/Gazelle/0.49/CVE-2026-40562-r1.patch","tags":["patch","Patch","fix"]},{"url":"https://metacpan.org/release/KAZEBURO/Gazelle-0.50/changes","tags":["release-notes","Release Notes","advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/05/06/7","tags":["Mailing List","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40562","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-mjw2-gf6p-382h"},{"url":"https://cpan.org/modules","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40562.json","tags":["advisory"]},{"url":"https://github.com/kazeburo/Gazelle","tags":["package"]},{"url":"https://advisories.mageia.org/MGASA-2026-0130.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35485","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/05/06/7","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-40562","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.","status":"published","published":"2026-05-06T12:36:34.715Z","modified":"2026-05-07T16:13:49.501Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T13:43:11.445168Z"}],"euvd":[{"id":"EUVD-2026-27825","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.","status":"published","published":"2026-05-06T12:36:34Z","modified":"2026-05-07T16:13:49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T19:05:14.902845Z"}],"ghsa":[{"id":"GHSA-mjw2-gf6p-382h","title":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via Improper Header...","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.","status":"published","published":"2026-05-06T15:32:40Z","modified":"2026-05-07T18:31:40Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:07:57.010667Z"}],"nvd":[{"id":"CVE-2026-40562","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.","status":"published","published":"2026-05-06T13:16:09.11Z","modified":"2026-10-26T19:10:00.163Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:17.418622Z"}],"osv":[{"id":"CVE-2026-40562","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.","status":"published","published":"2026-05-06T12:36:34.715Z","modified":"2026-10-28T02:31:09.266881136Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:45:03.424067Z"},{"id":"MGASA-2026-0130","title":"Updated perl-Gazelle packages fix security vulnerability","description":"Gazelle versions through 0.49 for Perl allows HTTP Request Smuggling via\nImproper Header Precedence. (CVE-2026-40562)\n","status":"published","published":"2026-05-13T07:00:52Z","modified":"2026-05-13T07:15:06.330891Z","updated_at":"2026-11-02T15:49:43.178336Z"}]}}