{"id":"CVE-2026-41493","aliases":["DEBIAN-CVE-2026-41493","EUVD-2026-28554","GHSA-3jfp-46x4-xgfj","OESA-2026-2205","OESA-2026-2206","OESA-2026-2207","OESA-2026-2208","OESA-2026-2285","UBUNTU-CVE-2026-41493","USN-8394-1"],"status":"published","title":"yard: Possible arbitrary path traversal and file access via yard server","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","severity":{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00388,"percentile":0.33221,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2026-04-17T22:21:03Z","modified":"2026-10-28T02:30:45Z","fixes":[{"ecosystem":"RubyGems","package":"yard","fixed_in":["0.9.42"],"sources":["ghsa","osv"]},{"ecosystem":"openEuler:20.03-LTS-SP4","package":"rubygem-yard","fixed_in":["0.9.26-4.oe2003sp4"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS","package":"rubygem-yard","fixed_in":["0.9.34-3.oe2403"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP1","package":"rubygem-yard","fixed_in":["0.9.34-3.oe2403sp1"],"sources":["osv"]},{"ecosystem":"openEuler:24.03-LTS-SP3","package":"rubygem-yard","fixed_in":["0.9.34-3.oe2403sp3"],"sources":["osv"]},{"ecosystem":"openEuler:22.03-LTS-SP4","package":"rubygem-yard","fixed_in":["0.9.26-4.oe2203sp4"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:16.04:LTS","package":"yard","fixed_in":["0.8.7.6+git20160220-3ubuntu0.1~esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:18.04:LTS","package":"yard","fixed_in":["0.9.12-2ubuntu0.1~esm2"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:20.04:LTS","package":"yard","fixed_in":["0.9.24-1+deb11u1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:22.04:LTS","package":"yard","fixed_in":["0.9.26-1ubuntu0.1+esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:24.04:LTS","package":"yard","fixed_in":["0.9.36-1ubuntu0.1~esm1"],"sources":["osv"]},{"ecosystem":"Ubuntu:Pro:26.04:LTS","package":"yard","fixed_in":["0.9.38-1ubuntu0.1~esm1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.42"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.28-2","0.9.28-2+deb12u1","0.9.28-2+deb12u2","0.9.34-1","0.9.35-1","0.9.36-1","0.9.37-1","0.9.38-1","0.9.39-1","0.9.44-1","0.9.45-1","1.17.patch1-5","2.2-3","2.2-4","2.2-5"]},{"source":"osv","ecosystem":"Debian:13","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.37-1","0.9.38-1","0.9.39-1","0.9.44-1","0.9.45-1","1.17.patch1-5","2.2-3","2.2-4","2.2-5"]},{"source":"osv","ecosystem":"Debian:14","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.37-1","0.9.38-1","0.9.39-1","0.9.44-1","0.9.45-1","1.17.patch1-5","2.2-3","2.2-4","2.2-5"]},{"source":"osv","ecosystem":"RubyGems","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.42"}]}],"versions":["0.2.0","0.2.1","0.2.2","0.2.3","0.2.3.2","0.2.3.3","0.2.3.4","0.2.3.5","0.4.0","0.5.0","0.5.1","0.5.1p1","0.5.2","0.5.3","0.5.4","0.5.5","0.5.6","0.5.7","0.5.8","0.6.0","0.6.1","0.6.2","0.6.3","0.6.4","0.6.5","0.6.6","0.6.7","0.6.8","0.7.0","0.7.1","0.7.2","0.7.3","0.7.4","0.7.5","0.8.0","0.8.1","0.8.2","0.8.2.1","0.8.3","0.8.4","0.8.4.1","0.8.5","0.8.5.1","0.8.5.2","0.8.6","0.8.6.1","0.8.6.2","0.8.7","0.8.7.1","0.8.7.2","0.8.7.3","0.8.7.4","0.8.7.5","0.8.7.6","0.9.0","0.9.1","0.9.10","0.9.11","0.9.12","0.9.13","0.9.14","0.9.15","0.9.16","0.9.17","0.9.18","0.9.19","0.9.2","0.9.20","0.9.21","0.9.22","0.9.23","0.9.24","0.9.25","0.9.26","0.9.27","0.9.28","0.9.29","0.9.3","0.9.30","0.9.31","0.9.32","0.9.33","0.9.34","0.9.35","0.9.36","0.9.37","0.9.38","0.9.39","0.9.4","0.9.40","0.9.41","0.9.5","0.9.6","0.9.7","0.9.8","0.9.9"]},{"source":"osv","ecosystem":"openEuler:20.03-LTS-SP4","package":"rubygem-yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.26-4.oe2003sp4"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS","package":"rubygem-yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.34-3.oe2403"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP1","package":"rubygem-yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.34-3.oe2403sp1"}]}]},{"source":"osv","ecosystem":"openEuler:24.03-LTS-SP3","package":"rubygem-yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.34-3.oe2403sp3"}]}]},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP4","package":"rubygem-yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.26-4.oe2203sp4"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8.7.6+git20160220-3ubuntu0.1~esm2"}]}],"versions":["0.8.7.6-1","0.8.7.6+git20160220-3","0.8.7.6+git20160220-3ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"yard","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.12-2ubuntu0.1~esm2"}]}],"versions":[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Advisory","advisory","web","report"]},{"url":"https://github.com/lsegal/yard/releases/tag/v0.9.42","tags":["x_refsource_MISC","Product","Release Notes","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41493","tags":["advisory"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/yard/CVE-2026-41493.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3jfp-46x4-xgfj"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41493.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-41493","tags":["advisory"]},{"url":"https://github.com/lsegal/yard","tags":["package"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2205","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2206","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2207","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2208","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2285","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-41493","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-41493","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8394-1","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-41493","title":"yard: Possible arbitrary path traversal and file access via yard server","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T13:13:49.232Z","modified":"2026-05-08T21:27:41.408Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T13:41:08.498858Z"}],"euvd":[{"id":"EUVD-2026-28554","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T13:13:49Z","modified":"2026-05-08T21:27:41Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T19:05:14.089367Z"}],"ghsa":[{"id":"GHSA-3jfp-46x4-xgfj","title":"yard: Possible arbitrary path traversal and file access via yard server","description":"### Impact\n\nA path traversal vulnerability was discovered in YARD \u003c= 0.9.41 when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions.\n\nThe original patch in [GHSA-xfhh-rx56-rxcr](https://github.com/lsegal/yard/security/advisories/GHSA-xfhh-rx56-rxcr) was incorrectly applied.\n\n### Patches\n\nPlease upgrade to YARD v0.9.42 immediately if you are relying on yard server to host documentation in any untrusted environments without WEBrick and rely on `--docroot`.\n\n### Workarounds\n\nFor users who cannot upgrade, it is possible to perform path sanitization of HTTP requests at your webserver level. WEBrick, for example, can perform such sanitization by default (which you can use via yard server -s webrick), as can certain rules in your webserver configuration.","status":"published","published":"2026-04-17T22:21:03Z","modified":"2026-05-29T21:44:56Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:40:15.638885Z"}],"nvd":[{"id":"CVE-2026-41493","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T14:16:33.55Z","modified":"2026-10-26T19:10:00.163Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"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":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:12:17.842772Z"}],"osv":[{"id":"CVE-2026-41493","title":"yard: Possible arbitrary path traversal and file access via yard server","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T13:13:49.232Z","modified":"2026-10-28T02:30:45.430300099Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:45:03.764807Z"},{"id":"DEBIAN-CVE-2026-41493","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T14:16:33.55Z","modified":"2026-10-27T09:47:40.309124406Z","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":"GHSA-3jfp-46x4-xgfj","title":"yard: Possible arbitrary path traversal and file access via yard server","description":"### Impact\n\nA path traversal vulnerability was discovered in YARD \u003c= 0.9.41 when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions.\n\nThe original patch in [GHSA-xfhh-rx56-rxcr](https://github.com/lsegal/yard/security/advisories/GHSA-xfhh-rx56-rxcr) was incorrectly applied.\n\n### Patches\n\nPlease upgrade to YARD v0.9.42 immediately if you are relying on yard server to host documentation in any untrusted environments without WEBrick and rely on `--docroot`.\n\n### Workarounds\n\nFor users who cannot upgrade, it is possible to perform path sanitization of HTTP requests at your webserver level. WEBrick, for example, can perform such sanitization by default (which you can use via yard server -s webrick), as can certain rules in your webserver configuration.","status":"published","published":"2026-04-17T22:21:03Z","modified":"2026-06-09T10:55:28Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:35.747385Z"},{"id":"OESA-2026-2205","title":"rubygem-yard security update","description":"YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.\r\n\r\nSecurity Fix(es):\n\nYARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.(CVE-2026-41493)","status":"published","published":"2026-05-09T11:11:11Z","modified":"2026-08-18T01:19:51.673961337Z","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":"2026-11-02T15:52:46.087701Z"},{"id":"OESA-2026-2206","title":"rubygem-yard security update","description":"YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.\r\n\r\nSecurity Fix(es):\n\nYARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.(CVE-2026-41493)","status":"published","published":"2026-05-09T11:11:11Z","modified":"2026-08-18T01:19:51.671832498Z","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":"2026-11-02T15:52:46.087701Z"},{"id":"OESA-2026-2207","title":"rubygem-yard security update","description":"YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.\r\n\r\nSecurity Fix(es):\n\nYARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.(CVE-2026-41493)","status":"published","published":"2026-05-09T11:11:11Z","modified":"2026-08-18T01:19:51.661054379Z","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":"2026-11-02T15:52:46.087701Z"},{"id":"OESA-2026-2208","title":"rubygem-yard security update","description":"YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.\r\n\r\nSecurity Fix(es):\n\nYARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.(CVE-2026-41493)","status":"published","published":"2026-05-09T11:11:11Z","modified":"2026-08-18T01:19:51.624340847Z","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":"2026-11-02T15:52:46.087701Z"},{"id":"OESA-2026-2285","title":"rubygem-yard security update","description":"YARD is a documentation generation tool for the Ruby programming language. It enables the user to generate consistent, usable documentation that can be exported to a number of formats very easily, and also supports extending for custom Ruby constructs such as custom class level definitions.\r\n\r\nSecurity Fix(es):\n\nYARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.(CVE-2026-41493)","status":"published","published":"2026-05-15T11:11:15Z","modified":"2026-08-18T01:19:53.040157515Z","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":"2026-11-02T15:52:46.087701Z"},{"id":"UBUNTU-CVE-2026-41493","description":"YARD is a Ruby Documentation tool. Prior to version 0.9.42, a path traversal vulnerability was discovered in YARD when using yard server to serve documentation. This bug would allow unsanitized HTTP requests to access arbitrary files on the machine of a yard server host under certain conditions. This issue has been patched in version 0.9.42.","status":"published","published":"2026-05-08T14:16:00Z","modified":"2026-10-17T12:58:15.436330277Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"},{"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":"2026-11-02T16:56:18.393417Z"},{"id":"USN-8394-1","title":"yard vulnerability","description":"It was discovered that YARD incorrectly sanitized paths in its built-in\ndocumentation server. An attacker could possibly use this issue to read arbitrary\nfiles from the server host.","status":"published","published":"2026-06-05T08:11:23Z","modified":"2026-06-10T18:29:38.231680156Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}