High
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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.
- 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-2026-26278
- 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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.
osv:UBUNTU-CVE-2026-26278
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": "63a3cbc4ba77f607088d486665a3ccd0f9f10ab804585e6253d09f2b6ea09816",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-26278",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-26278",
"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. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.",
"evidence": "osv:UBUNTU-CVE-2026-26278",
"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": {
"value": "node-webfont",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "11.4.0+dfsg2+~cs35.7.26-10",
"evidence": "/affected/1/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-13ubuntu2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "node-webfont",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "11.4.0+dfsg2+~cs35.7.26-18",
"evidence": "/affected/2/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-19",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "node-webfont",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "11.4.0+dfsg2+~cs35.7.26-13ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-14",
"evidence": "/affected/3/versions"
},
{
"value": "11.4.0+dfsg2+~cs35.7.26-15",
"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"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-26278",
"aliases": [
"UBUNTU-CVE-2026-26278"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"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-2026-26278.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-webfont",
"binary_version": "11.4.0+dfsg2+~cs35.7.26-7ubuntu1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-webfont",
"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"11.4.0+dfsg2+~cs35.7.26-10",
"11.4.0+dfsg2+~cs35.7.26-13ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26278.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-webfont",
"binary_version": "11.4.0+dfsg2+~cs35.7.26-13ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-webfont",
"purl": "pkg:deb/ubuntu/node-webfont?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"11.4.0+dfsg2+~cs35.7.26-18",
"11.4.0+dfsg2+~cs35.7.26-19"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26278.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-webfont",
"binary_version": "11.4.0+dfsg2+~cs35.7.26-19"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "node-webfont",
"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": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-26278.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "node-webfont",
"binary_version": "11.4.0+dfsg2+~cs35.7.26-18"
}
]
}
}
],
"modified": "2026-10-17T12:56:12.578793112Z",
"provider": "osv",
"upstream": [
"CVE-2026-26278"
],
"references": [
"https://ubuntu.com/security/CVE-2026-26278",
"https://www.cve.org/CVERecord?id=CVE-2026-26278",
"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj",
"https://github.com/NaturalIntelligence/fast-xml-parser/commit/910dae5be2de2955e968558fadf6e8f74f117a77",
"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6"
]
},
"related_cves": [
{
"value": "CVE-2026-26278",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 354949,
"published_at": "2026-02-19T20:25:00+00:00"
}