Critical
node-webfont — security advisory
fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.
- Products
- node-webfont
- Affected versions
- 11.4.0+dfsg2+~cs35.7.26-10, 11.4.0+dfsg2+~cs35.7.26-13ubuntu2, 11.4.0+dfsg2+~cs35.7.26-14, 11.4.0+dfsg2+~cs35.7.26-15, 11.4.0+dfsg2+~cs35.7.26-16build1, 11.4.0+dfsg2+~cs35.7.26-18, 11.4.0+dfsg2+~cs35.7.26-19, 11.4.0+dfsg2+~cs35.7.26-7ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-25896
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:51 UTC · Revision 1
Source evidence
fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, ", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.
osv:UBUNTU-CVE-2026-25896
node-webfont
Fixed versions: Not specified
node-webfont
Fixed versions: Not specified
node-webfont
Fixed versions: Not specified
node-webfont
Fixed versions: Not specified
Complete source record
{
"id": "78fec4ef2bde840f5eefdab73821c420eea7dba24c2d17448dc66d1939ae78eb",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-25896",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-25896",
"summary": "fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. From 4.1.3to before 5.3.5, a dot (.) in a DOCTYPE entity name is treated as a regex wildcard during entity replacement, allowing an attacker to shadow built-in XML entities (<, >, &, \", ') with arbitrary values. This bypasses entity encoding and leads to XSS when parsed output is rendered. This vulnerability is fixed in 5.3.5.",
"evidence": "osv:UBUNTU-CVE-2026-25896",
"products": [
{
"name": {
"value": "node-webfont",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "11.4.0+dfsg2+~cs35.7.26-7ubuntu1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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},
"prerequisites": [],
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{
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"evidence": "/affected/1/versions"
}
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{
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},
"prerequisites": [],
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"affected_versions": [
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"evidence": "/affected/2/versions"
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{
"value": "11.4.0+dfsg2+~cs35.7.26-19",
"evidence": "/affected/2/versions"
}
]
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{
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},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-16build1",
"evidence": "/affected/3/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-18",
"evidence": "/affected/3/versions"
}
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],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-25896",
"aliases": [
"UBUNTU-CVE-2026-25896"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-webfont",
"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"11.4.0+dfsg2+~cs35.7.26-7ubuntu1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-25896.json"
},
"ecosystem_specific": {
"binaries": [
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}
},
{
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"package": {
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"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
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"11.4.0+dfsg2+~cs35.7.26-13ubuntu2"
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"database_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
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"11.4.0+dfsg2+~cs35.7.26-19"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"11.4.0+dfsg2+~cs35.7.26-13ubuntu2",
"11.4.0+dfsg2+~cs35.7.26-14",
"11.4.0+dfsg2+~cs35.7.26-15",
"11.4.0+dfsg2+~cs35.7.26-16build1",
"11.4.0+dfsg2+~cs35.7.26-18"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
"binary_name": "node-webfont",
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}
]
}
}
],
"modified": "2026-10-17T12:56:12.580940623Z",
"provider": "osv",
"upstream": [
"CVE-2026-25896"
],
"references": [
"https://ubuntu.com/security/CVE-2026-25896",
"https://www.cve.org/CVERecord?id=CVE-2026-25896",
"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-m7jm-9gc2-mpf2",
"https://github.com/NaturalIntelligence/fast-xml-parser/commit/943ef0eb1b2d3284e72dd74f44a042ee9f07026e",
"https://github.com/NaturalIntelligence/fast-xml-parser/commit/ddcd0acf26ddd682cb0dc15a2bd6aa3b96bb1e69",
"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.5"
]
},
"related_cves": [
{
"value": "CVE-2026-25896",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354950,
"published_at": "2026-02-20T21:19:00+00:00"
}