{"id":"CVE-2026-40560","aliases":["DEBIAN-CVE-2026-40560","EUVD-2026-26189","GHSA-gwjf-hg8j-jwvr","MGASA-2026-0119","UBUNTU-CVE-2026-40560","openSUSE-SU-2026:10757-1"],"status":"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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00487,"percentile":0.42304,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-444"],"published":"2026-04-28T23:46:37Z","modified":"2026-10-28T02:30:59Z","fixes":[{"ecosystem":"Debian:13","package":"starman","fixed_in":["0.4018-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"starman","fixed_in":["0.4018-1"],"sources":["osv"]},{"ecosystem":"Mageia:9","package":"perl-Starman","fixed_in":["0.401.800-1.mga9"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"perl-Starman","fixed_in":["0.4018-1.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4016-1","0.4017-1","0.4018-1"]},{"source":"osv","ecosystem":"Debian:13","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4018-0+deb13u1"}]}],"versions":["0.4017-1"]},{"source":"osv","ecosystem":"Debian:14","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4018-1"}]}],"versions":["0.4017-1"]},{"source":"osv","ecosystem":"Mageia:9","package":"perl-Starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.401.800-1.mga9"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-3","0.4015-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4015-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4016-1","0.4017-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4017-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4017-1build1","0.4018-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4017-1","0.4017-1build1"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"perl-Starman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.4018-1.1"}]}]}],"products":[{"vendor":"miyagawa","product":"starman"}],"references":[{"url":"https://github.com/miyagawa/Starman/commit/ced205f0805027e9d9c0731f8c40b104220604ed.patch","tags":["patch","Patch","Third Party Advisory","fix"]},{"url":"https://metacpan.org/release/MIYAGAWA/Starman-0.4018/changes","tags":["release-notes","Product","Release Notes","advisory","web"]},{"url":"https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.3","tags":["Third Party Advisory","web"]},{"url":"http://www.openwall.com/lists/oss-security/2026/04/29/1","tags":["Mailing List","Third Party Advisory","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40560","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-gwjf-hg8j-jwvr"},{"url":"https://cpan.org/modules","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40560.json","tags":["advisory"]},{"url":"https://github.com/miyagawa/Starman","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-40560","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0119.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35448","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/04/29/1","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2026-40560","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-40560","tags":["report"]},{"url":"https://lists.security.metacpan.org/cve-announce/msg/39426182/","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40560","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-40560","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.","status":"published","published":"2026-04-28T23:46:37.78Z","modified":"2026-04-29T19:06:02.932Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T13:43:11.445168Z"}],"euvd":[{"id":"EUVD-2026-26189","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.","status":"published","published":"2026-04-28T23:46:37Z","modified":"2026-04-29T19:06:02Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T19:05:19.555165Z"}],"ghsa":[{"id":"GHSA-gwjf-hg8j-jwvr","title":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header...","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.","status":"published","published":"2026-04-29T00:30:24Z","modified":"2026-04-29T15:31:45Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:07:51.219984Z"}],"nvd":[{"id":"CVE-2026-40560","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.","status":"published","published":"2026-04-29T00:16:03.927Z","modified":"2026-07-24T21:10:00.143Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:12:16.626888Z"}],"osv":[{"id":"CVE-2026-40560","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.","status":"published","published":"2026-04-28T23:46:37.78Z","modified":"2026-10-28T02:30:59.817492468Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:45:03.424067Z"},{"id":"DEBIAN-CVE-2026-40560","description":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence.  Starman 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.  An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.","status":"published","published":"2026-04-29T00:16:03.927Z","modified":"2026-10-01T03:03:11.708636555Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:54.892385Z"},{"id":"UBUNTU-CVE-2026-40560","description":"Starman versions before 0.4018 for Perl allows HTTP Request Smuggling via Improper Header Precedence. Starman 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. An attacker could exploit this to smuggle malicious HTTP requests via a front-end reverse proxy.","status":"published","published":"2026-04-29T00:16:00Z","modified":"2026-10-17T12:58:52.872905958Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"MGASA-2026-0119","title":"Updated perl-Starman packages fix security vulnerability","description":"Starman versions before 0.4018 for Perl allow HTTP Request Smuggling\nvia Improper Header Precedence.\nStarman incorrectly prioritizes \"Content-Length\" over\n\"Transfer-Encoding: chunked\" when both headers are present in an HTTP\nrequest. Per RFC 7230 3.3.3, Transfer-Encoding must take precedence.\nAn attacker could exploit this to smuggle malicious HTTP requests via a\nfront-end reverse proxy.\n","status":"published","published":"2026-05-07T05:06:13Z","modified":"2026-05-07T05:15:18.593348Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2026:10757-1","title":"perl-Starman-0.4018-1.1 on GA media","description":"These are all security issues fixed in the perl-Starman-0.4018-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-05-12T00:00:00Z","modified":"2026-05-13T07:45:07.612882Z","updated_at":"2026-11-02T16:58:38.415593Z"}]}}