{"id":"CVE-2026-101019","aliases":["AZL-108452","BELL-CVE-2026-101019","DEBIAN-CVE-2026-101019","EUVD-2026-101121","GHSA-fvf3-54p5-jg2m","UBUNTU-CVE-2026-101019"],"status":"published","title":"NGINX ngx_http_js_module vulnerability","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","severity":{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.0021,"percentile":0.1123,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-436"],"published":"2026-10-14T14:40:29Z","modified":"2026-11-02T14:16:58Z","fixes":[{"ecosystem":"Azure Linux:3","package":"nginx","fixed_in":["1.30.6-1"],"sources":["osv"]},{"ecosystem":"Alpaquita:23","package":"nginx","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:23","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"nginx","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"nginx","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:23","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:25","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"BellSoft Hardened Containers:stream","package":"nginx-base","fixed_in":["1.30.6-r0"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libnginx-mod-js","fixed_in":["1.0.2-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"nginx","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.30.6-1"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"nginx","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.22.1-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:23","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"nginx","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.28.0-r3"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:25","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"nginx","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.22.1-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Alpaquita:stream","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:23","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:25","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"BellSoft Hardened Containers:stream","package":"nginx-base","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.30.3-r0"},{"fixed":"1.30.6-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.12-1","0.7.12-2","0.7.12-2~exp1","0.7.12-2~exp2","0.7.9-2","0.8.0-1","0.8.1-1","0.8.2-1","0.8.4-1","0.8.5-1","0.8.9-1","0.9.1-1","0.9.4-1","0.9.6-1","0.9.8-1","0.9.9-1","0.9.9-2","1.0.0-1","1.0.0-2","1.0.0-3","1.0.0-4","1.0.1-1","1.0.2-1","1.0.2-2"]},{"source":"osv","ecosystem":"Debian:13","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.9-1","0.9.1-1","0.9.4-1","0.9.6-1","0.9.8-1","0.9.9-1","0.9.9-2","1.0.0-1","1.0.0-2","1.0.0-3","1.0.0-4","1.0.1-1","1.0.2-1","1.0.2-2"]},{"source":"osv","ecosystem":"Debian:14","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.2-1"}]}],"versions":["0.8.9-1","0.9.1-1","0.9.4-1","0.9.6-1","0.9.8-1","0.9.9-1","0.9.9-2","1.0.0-1","1.0.0-2","1.0.0-3","1.0.0-4","1.0.1-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.7.12-2","0.8.2-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.4-1build2","0.9.9-2","1.0.0-1","1.0.0-3"]},{"source":"osv","ecosystem":"Ubuntu:Pro:26.04:LTS","package":"libnginx-mod-js","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.1-1ubuntu2","0.9.1-1ubuntu3","0.9.4-1~build1","0.9.4-1","0.9.4-1build1","0.9.4-1build2","0.9.4-1ubuntu0.1~esm1"]}],"products":[{"vendor":"f5","product":"nginx javascript"}],"references":[{"url":"https://my.f5.com/manage/s/article/K000162615","tags":["vendor-advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101019","tags":["web"]},{"url":"https://github.com/advisories/GHSA-fvf3-54p5-jg2m"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-101019","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-101019","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-101019","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-101019","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-101019","title":"NGINX ngx_http_js_module vulnerability","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T14:40:29.685Z","modified":"2026-10-15T16:43:46.354Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:20:09.808851Z"}],"euvd":[{"id":"EUVD-2026-101121","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T14:40:29Z","modified":"2026-10-15T16:43:46Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:00:11.901066Z"}],"ghsa":[{"id":"GHSA-fvf3-54p5-jg2m","title":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity...","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T15:32:22Z","modified":"2026-10-14T15:32:27Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"},{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/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":"high"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T15:13:26.117603Z"}],"nvd":[{"id":"CVE-2026-101019","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T15:17:01.697Z","modified":"2026-10-15T17:17:08.083Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/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":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-436"],"updated_at":"2026-11-02T14:12:58.99337Z"}],"osv":[{"id":"BELL-CVE-2026-101019","status":"published","published":"2026-10-20T06:09:24.581768Z","modified":"2026-10-22T08:30:04.866445191Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:28:23.037038Z"},{"id":"DEBIAN-CVE-2026-101019","description":"Description NGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.  Impact In affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.     Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T15:17:01.697Z","modified":"2026-10-24T05:00:08.791101014Z","cvss":[{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/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":"high"}],"updated_at":"2026-11-02T15:45:48.440897Z"},{"id":"UBUNTU-CVE-2026-101019","description":"Description NGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend. Impact In affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T15:17:00Z","modified":"2026-10-28T17:50:26Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N","level":"medium"},{"version":"4.0","score":8.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:55:58.519486Z"},{"id":"AZL-108452","title":"CVE-2026-101019 affecting package nginx for versions less than 1.30.6-1","description":"Description\nNGINX JavaScript (njs) has a vulnerability where the njs XML module exposes entity-backed XML attributes inconsistently with libxml2 canonicalization. In both the built-in njs and QuickJS backends during the canonicalization process, the $attr$Name getter may return undefined for an explicitly present attribute containing an internal entity reference. The $attrs getter may return a value derived only from the first attribute child. This may allow an unauthenticated attacker that invests significant effort in obtaining a genuinely signed document to skip validation while signature verification succeeds. An nginx-saml deployment is a confirmed affected consumer when run with the built-in njs backend.\n\nImpact\nIn affected signed-XML consumers, an unauthenticated attacker can cause security-relevant attributes to appear absent or truncated while signature verification succeeds. In nginx-saml, this can bypass expiry, Destination, and request-correlation checks, enabling replay or acceptance of a response outside its intended context. It does not permit signature or identity forgery, or a direct availability impact. There is no control plane exposure; this is a data plane issue only.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","status":"published","published":"2026-10-14T15:17:01Z","modified":"2026-11-02T14:16:58.16613717Z","updated_at":"2026-11-02T15:28:01.725816Z"}]}}