{"id":"CVE-2026-44664","aliases":["GHSA-45c6-75p6-83cc"],"url":"https://o3.security/vulnerability/CVE-2026-44664","summary":"fast-xml-builder: Comment Value bypass regex","details":"# Summary\nThe fix for https://github.com/advisories/GHSA-gh4j-gqv2-49f6 in fast-xml-parser sanitizes `--` sequences in XML comment content using .replace(/--/g, '- -'). This skip the values containing three consecutive dashes (e.g., --->...), allowing an attacker to break out of an XML comment and inject arbitrary XML/HTML content.\n\n### Impact\nAny application with comment property enabled allow attacker to inject malicious or unwanted code like JS script tag in the XML/HTML output.\n\n### Workarounds\nCheck for the presence of 3 consecutive dashes externally in the property value used for comment tag.","published":"2026-05-13T15:27:34.716Z","modified":"2026-08-12T03:51:47.434092154Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00194,"percentile":0.09125,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"fast-xml-builder","fixedVersion":"1.1.6"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44664.json"},{"type":"ADVISORY","url":"https://github.com/NaturalIntelligence/fast-xml-builder/security/advisories/GHSA-45c6-75p6-83cc"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44664"},{"type":"WEB","url":"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-gh4j-gqv2-49f6"},{"type":"PACKAGE","url":"https://github.com/NaturalIntelligence/fast-xml-builder"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.434092154Z"}}