CVE catalog
CVE-2026-26278
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
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.94% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-webfont | sid | 11.4.0+dfsg2+~cs35.7.26-22 | vulnerable |
| Debian | node-webfont | forky | 11.4.0+dfsg2+~cs35.7.26-22 | vulnerable |
| Debian | node-webfont | trixie | 11.4.0+dfsg2+~cs35.7.26-13 | vulnerable |
| Debian | node-webfont | bookworm | 11.4.0+dfsg2+~cs35.7.26-7 | vulnerable |
| Cpe | node-webfont | Not reported | Not reported | vulnerable |
| Cpe | fast-xml-parser | Not reported | 5.3.6 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-webfont | source | sid | (unfixed) | not yet assigned | Not reported | [1147730] |
| Debian | node-webfont | source | forky | (unfixed) | not yet assigned | Not reported | [1147730] |
| Debian | node-webfont | source | trixie | (unfixed) | not yet assigned | Not reported | [1147730] |
| Debian | node-webfont | source | bookworm | (unfixed) | not yet assigned | Not reported | [1147730] |
| Cpe | fast-xml-parser | cpe | Not reported | 5.3.6 | Not reported | NVD-CVE-2026-26278 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-webfont]Affected
Details (2)
11.4.0+dfsg2+~cs35.7.26-7· all · bookwormAffected
nvd · node-webfont · debian · bookworm; nvd · node-webfont · debian · 12
11.4.0+dfsg2+~cs35.7.26-7· all · bookwormAffected
nvd · node-webfont · debian · bookworm; nvd · node-webfont · debian · 12
[Debian 13 (Trixie)]
- [node-webfont]Affected
Details (2)
11.4.0+dfsg2+~cs35.7.26-13· all · trixieAffected
nvd · node-webfont · debian · 13
11.4.0+dfsg2+~cs35.7.26-13· all · trixieAffected
nvd · node-webfont · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-26278]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-26278]
- [https://security-tracker.debian.org/tracker/CVE-2026-26278]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26278.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0772.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]