{"id":"CVE-2026-126066","published":"2026-11-10T21:19:24.487","lastModified":"2026-11-10T21:19:24.617","description":"fast-xml-parser allows users to process XML from JS object without C/C++ based libraries or callbacks. Prior to 5.12.0, when the non-default stopNodes option is enabled, readStopNodeData() in OrderedObjParser.js calls readTagExp() for each less-than character in an unterminated stop-node body and repeatedly rescans the remaining input while looking for a closing greater-than character. An attacker who supplies XML containing many tag fragments without a later closing character can cause quadratic rescanning before parsing fails, blocking a Node.js event loop and causing CPU-exhaustion denial of service. This issue is fixed in version 5.12.0.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-407"],"vendors":[],"products":[],"references":[{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/0c3659348364959da62954b73728fb3bd05ebcb4","tags":[]},{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.12.0","tags":[]},{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-474x-hrwr-fgx4","tags":[]}],"exploitRefs":[{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/commit/0c3659348364959da62954b73728fb3bd05ebcb4","tags":[]},{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.12.0","tags":[]},{"url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-474x-hrwr-fgx4","tags":[]}],"hasPoc":true,"ai":null}