{"id":"CVE-2026-126064","aliases":["AZL-113338","DEBIAN-CVE-2026-126064","EUVD-2026-122836","GHSA-3w22-6jfg-527w","UBUNTU-CVE-2026-126064"],"status":"published","title":"Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Node#[]=` or `#lang=`","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-13","score":0.00155,"percentile":0.04683,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2026-11-10T20:17:13Z","modified":"2026-11-12T23:46:37Z","fixes":[{"ecosystem":"RubyGems","package":"nokogiri","fixed_in":["1.19.5"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"RubyGems","package":"nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.5"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"rubygem-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.19.4-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.13.10+dfsg-2","1.14.2+dfsg-1","1.14.3+dfsg-1","1.14.3+dfsg-2","1.15.4+dfsg-1","1.16.0+dfsg-1","1.16.0+dfsg-2","1.16.2+dfsg-1","1.16.4+dfsg-1","1.17.2+dfsg-1~exp1","1.18.10+dfsg-1","1.18.10+dfsg-2","1.18.10+dfsg-3","1.18.2+dfsg-1","1.19.1+dfsg-1","1.19.3+dfsg-1","1.19.4+dfsg-1","1.19.7+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.10+dfsg-1","1.18.10+dfsg-2","1.18.10+dfsg-3","1.18.2+dfsg-1","1.19.1+dfsg-1","1.19.3+dfsg-1","1.19.4+dfsg-1","1.19.7+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.10+dfsg-1","1.18.10+dfsg-2","1.18.10+dfsg-3","1.18.2+dfsg-1","1.19.1+dfsg-1","1.19.3+dfsg-1","1.19.4+dfsg-1","1.19.7+dfsg-1"]},{"source":"osv","ecosystem":"RubyGems","package":"nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.5"}]}],"versions":["1.0.0","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.0.6","1.0.7","1.1.0","1.1.1","1.10.0","1.10.0.rc1","1.10.1","1.10.10","1.10.2","1.10.3","1.10.4","1.10.5","1.10.6","1.10.7","1.10.8","1.10.9","1.11.0","1.11.0.rc1","1.11.0.rc2","1.11.0.rc3","1.11.0.rc4","1.11.1","1.11.2","1.11.3","1.11.4","1.11.5","1.11.6","1.11.7","1.12.0","1.12.0.rc1","1.12.1","1.12.2","1.12.3","1.12.4","1.12.5","1.13.0","1.13.1","1.13.10","1.13.2","1.13.3","1.13.4","1.13.5","1.13.6","1.13.7","1.13.8","1.13.9","1.14.0","1.14.0.rc1","1.14.1","1.14.2","1.14.3","1.14.4","1.14.5","1.15.0","1.15.1","1.15.2","1.15.3","1.15.4","1.15.5","1.15.6","1.15.7","1.16.0","1.16.0.rc1","1.16.1","1.16.2","1.16.3","1.16.4","1.16.5","1.16.6","1.16.7","1.16.8","1.17.0","1.17.1","1.17.2","1.18.0","1.18.0.rc1","1.18.1","1.18.10","1.18.2","1.18.3","1.18.4","1.18.5","1.18.6","1.18.7","1.18.8","1.18.9","1.19.0","1.19.1","1.19.2","1.19.3","1.19.4","1.2.0","1.2.1","1.2.2","1.2.3","1.3.0","1.3.1","1.3.2","1.3.3","1.4.0","1.4.1","1.4.2","1.4.2.1","1.4.3","1.4.3.1","1.4.4","1.4.4.1","1.4.4.2","1.4.5","1.4.6","1.4.7","1.5.0","1.5.0.beta.1","1.5.0.beta.2","1.5.0.beta.3","1.5.0.beta.4","1.5.1","1.5.1.rc1","1.5.10","1.5.11","1.5.2","1.5.3","1.5.3.rc2","1.5.3.rc3","1.5.3.rc4","1.5.3.rc5","1.5.3.rc6","1.5.4","1.5.4.rc1","1.5.4.rc2","1.5.4.rc3","1.5.5","1.5.5.rc1","1.5.5.rc2","1.5.5.rc3","1.5.6","1.5.6.rc1","1.5.6.rc2","1.5.6.rc3","1.5.7","1.5.7.rc1","1.5.7.rc2","1.5.7.rc3","1.5.8","1.5.9","1.6.0","1.6.0.rc1","1.6.1","1.6.2","1.6.2.1","1.6.2.rc1","1.6.2.rc2","1.6.2.rc3","1.6.3","1.6.3.1","1.6.3.rc1","1.6.3.rc2","1.6.3.rc3","1.6.4","1.6.4.1","1.6.5","1.6.6.1","1.6.6.2","1.6.6.3","1.6.6.4","1.6.7","1.6.7.1","1.6.7.2","1.6.7.rc2","1.6.7.rc3","1.6.7.rc4","1.6.8","1.6.8.1","1.6.8.rc1","1.6.8.rc2","1.6.8.rc3","1.7.0","1.7.0.1","1.7.1","1.7.2","1.8.0","1.8.1","1.8.2","1.8.3","1.8.4","1.8.5","1.9.0","1.9.0.rc1","1.9.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.9-2","1.5.9-3","1.6.0-1","1.6.1+ds-1","1.6.1+ds-1ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.6.2+ds-2build2","1.6.6.3-1","1.6.7-1","1.6.7.1-1","1.6.7.2-3","1.6.7.2-3build1","1.6.7.2-3ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.0-1","1.8.1-1","1.8.1-1build1","1.8.2-1build1","1.8.2-1ubuntu0.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.3+dfsg1-2","1.10.4+dfsg1-1","1.10.7+dfsg1-1","1.10.7+dfsg1-2","1.10.7+dfsg1-2build1","1.10.7+dfsg1-2ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.1+dfsg-2ubuntu1","1.11.7+dfsg-3","1.11.7+dfsg-3build1","1.13.1+dfsg-2","1.13.1+dfsg-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.14.3+dfsg-2","1.16.2+dfsg-1","1.16.2+dfsg-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.10+dfsg-3","1.19.1+dfsg-1","1.19.3+dfsg-1","1.19.4+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ruby-nokogiri","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.18.2+dfsg-1build1","1.18.10+dfsg-2","1.18.10+dfsg-3"]}],"products":[{"vendor":"sparklemotion","product":"nokogiri"}],"references":[{"url":"https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-3w22-6jfg-527w","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/sparklemotion/nokogiri/pull/3752","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/sparklemotion/nokogiri/commit/b15b518db9fd15fd6b046f73d1439c282e5cc425","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/sparklemotion/nokogiri/commit/feaed3c8c9bd9d81d064d4ca09b16044cd705d6f","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/sparklemotion/nokogiri/releases/tag/v1.19.5","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/GHSA-3w22-6jfg-527w.yml","tags":["web"]},{"url":"https://github.com/advisories/GHSA-3w22-6jfg-527w"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-126064","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126064.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-126064","tags":["advisory"]},{"url":"https://github.com/sparklemotion/nokogiri","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-126064","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-126064","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-126064","title":"Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Node#[]=` or `#lang=`","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T20:17:13.658Z","modified":"2026-11-10T20:57:32.805Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T22:18:27.383863Z"}],"euvd":[{"id":"EUVD-2026-122836","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T20:17:13Z","modified":"2026-11-10T20:57:32Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-10T23:24:26.96779Z"}],"ghsa":[{"id":"GHSA-3w22-6jfg-527w","title":"Nokogiri: Use-After-Free in Nokogiri when replacing an attribute value","description":"### Summary\n\nNokogiri's CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an existing XML attribute via `Nokogiri::XML::Node#[]=` or `Nokogiri::XML::Node#lang=`. If Ruby code had already accessed the attribute's child nodes, replacing the value could free those native child nodes while their wrappers remained reachable. Using one of those child nodes afterwards could cause an invalid read and a possible segfault.\n\nThis is the same class of issue as [GHSA-phwj-rprq-35pp](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-phwj-rprq-35pp), which was fixed for `Attr#value=` in Nokogiri 1.19.4.\n\nNokogiri 1.19.5 preserves all already-wrapped attribute child nodes before replacing the attribute value.\n\nJRuby is not affected.\n\n### Severity\n\nThe Nokogiri maintainers have evaluated this as low severity. Reaching it requires an unusual API-usage pattern that does not arise during normal use. The application must directly access an attribute's child nodes and then replace that same attribute's value via `Node#[]=` or `Node#lang=`. Nokogiri 1.19.5 makes this pattern safe with no change to the public API.\n\n### Mitigation\n\nUpgrade to Nokogiri 1.19.5 or later.\n\nAs a workaround, avoid accessing attribute child nodes directly via `Attr#children` or similar before replacing the same attribute's value.\n\n### Credit\n\nThis issue was responsibly reported by zx (@manus-pi).","status":"published","published":"2026-11-10T20:51:19Z","modified":"2026-11-10T20:51:29Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T20:57:14.224476Z"}],"nvd":[{"id":"CVE-2026-126064","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T21:19:24.147Z","modified":"2026-11-12T22:18:35.61Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/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":"low","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-11T00:21:54.825455Z"}],"osv":[{"id":"CVE-2026-126064","title":"Nokogiri: Possible Use-After-Free when setting an attribute value via `Nokogiri::XML::Node#[]=` or `#lang=`","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T20:17:13.658Z","modified":"2026-11-12T07:04:52.844834518Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-416"],"updated_at":"2026-11-12T03:30:55.144331Z"},{"id":"DEBIAN-CVE-2026-126064","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T21:19:24.147Z","modified":"2026-11-13T09:47:38.892626018Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/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":"low"}],"updated_at":"2026-11-11T11:06:10.823198Z"},{"id":"GHSA-3w22-6jfg-527w","title":"Nokogiri: Use-After-Free in Nokogiri when replacing an attribute value","description":"### Summary\n\nNokogiri's CRuby native extension could leave a Ruby wrapper pointing to freed memory when replacing the value of an existing XML attribute via `Nokogiri::XML::Node#[]=` or `Nokogiri::XML::Node#lang=`. If Ruby code had already accessed the attribute's child nodes, replacing the value could free those native child nodes while their wrappers remained reachable. Using one of those child nodes afterwards could cause an invalid read and a possible segfault.\n\nThis is the same class of issue as [GHSA-phwj-rprq-35pp](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-phwj-rprq-35pp), which was fixed for `Attr#value=` in Nokogiri 1.19.4.\n\nNokogiri 1.19.5 preserves all already-wrapped attribute child nodes before replacing the attribute value.\n\nJRuby is not affected.\n\n### Severity\n\nThe Nokogiri maintainers have evaluated this as low severity. Reaching it requires an unusual API-usage pattern that does not arise during normal use. The application must directly access an attribute's child nodes and then replace that same attribute's value via `Node#[]=` or `Node#lang=`. Nokogiri 1.19.5 makes this pattern safe with no change to the public API.\n\n### Mitigation\n\nUpgrade to Nokogiri 1.19.5 or later.\n\nAs a workaround, avoid accessing attribute child nodes directly via `Attr#children` or similar before replacing the same attribute's value.\n\n### Credit\n\nThis issue was responsibly reported by zx (@manus-pi).","status":"published","published":"2026-11-10T20:51:19Z","modified":"2026-11-10T21:00:04.03627405Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T21:13:26.339973Z"},{"id":"UBUNTU-CVE-2026-126064","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-12T00:00:00Z","modified":"2026-11-13T21:05:30.538368342Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-13T21:30:20.292037Z"},{"id":"AZL-113338","title":"CVE-2026-126064 affecting package rubygem-nokogiri 1.19.4-1","description":"Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, the CRuby native extension can leave Ruby wrappers pointing to freed memory when Nokogiri::XML::Node#[]= or Nokogiri::XML::Node#lang= replaces an existing attribute value after code has accessed the attribute's child nodes. Replacing the value frees native child nodes while their wrappers remain reachable, and later use of those wrappers can cause an invalid read or process segfault. JRuby is not affected. This issue is fixed in version 1.19.5.","status":"published","published":"2026-11-10T21:19:24Z","modified":"2026-11-11T14:17:33.236742249Z","updated_at":"2026-11-11T14:42:54.020399Z"}]}}