libnginx-mod-js — security advisory
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.
- Products
- libnginx-mod-js
- Affected 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
- Fixed versions
- 1.0.2-1
- CVEs
- CVE-2026-101019
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 03:39 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2026-101019
libnginx-mod-js
Fixed versions: Not specified
libnginx-mod-js
Fixed versions: Not specified
libnginx-mod-js
Fixed versions: 1.0.2-1
Complete source record
{
"id": "d0f0d9dd7794268a2def08f404b3a06224f57014d2f1c72af3e6aa1d4063a904",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-101019",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-101019",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-101019",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"value": "0.9.9-2",
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{
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{
"value": "1.0.0-2",
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},
{
"value": "1.0.0-3",
"evidence": "/affected/1/versions"
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{
"value": "1.0.0-4",
"evidence": "/affected/1/versions"
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{
"value": "1.0.1-1",
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{
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{
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],
"affected_versions": [
{
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"evidence": "/affected/2/versions"
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{
"value": "0.9.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "0.9.4-1",
"evidence": "/affected/2/versions"
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{
"value": "0.9.6-1",
"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
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{
"value": "0.9.9-1",
"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
"value": "1.0.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.0.1-1",
"evidence": "/affected/2/versions"
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]
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],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-101019",
"aliases": [
"DEBIAN-CVE-2026-101019"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
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"affected": [
{
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"events": [
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"package": {
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"purl": "pkg:deb/debian/libnginx-mod-js?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"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",
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"1.0.0-4",
"1.0.1-1",
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}
},
{
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"package": {
"name": "libnginx-mod-js",
"purl": "pkg:deb/debian/libnginx-mod-js?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
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"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-101019.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
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"events": [
{
"introduced": "0"
},
{
"fixed": "1.0.2-1"
}
]
}
],
"package": {
"name": "libnginx-mod-js",
"purl": "pkg:deb/debian/libnginx-mod-js?arch=source&distro=forky",
"ecosystem": "Debian:14"
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},
"ecosystem_specific": {
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}
}
],
"modified": "2026-10-24T05:00:08.791101014Z",
"provider": "osv",
"upstream": [
"CVE-2026-101019"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-101019"
]
},
"related_cves": [
{
"value": "CVE-2026-101019",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 428195,
"published_at": "2026-10-14T15:17:01.697+00:00"
}