Detections
Analytics
CVE-2026-26278
high
Description
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.
References
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26278.json
https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj
https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6
https://bugzilla.redhat.com/show_bug.cgi?id=2441120
https://access.redhat.com/security/cve/CVE-2026-26278
https://access.redhat.com/errata/RHSA-2026:7128
https://access.redhat.com/errata/RHSA-2026:7110