{"id":"CVE-2026-49825","aliases":["GHSA-4jhm-jv67-739f","PYSEC-2026-2614"],"url":"https://o3.security/vulnerability/CVE-2026-49825","summary":"lxml: javascript: URL bypass in Cleaner via xlink:href","details":"lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in ``lxml.html.defs.link_attrs`` were missing ``xlink:href``, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxml_html_clean 0.4.5.","published":"2026-08-20T14:42:30.748Z","modified":"2026-08-23T03:43:00.224485862Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N"},"epss":{"score":0.0024,"percentile":0.14975,"asOf":"2026-09-08"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"lxml-html-clean","fixedVersion":"0.4.5"}],"fix":{"url":"https://github.com/fedora-python/lxml_html_clean/commit/322357ac61c6cf80fcbaba53b4e92e31f3ded9f2","label":"fedora-python/lxml_html_clean@322357a"},"references":[{"type":"WEB","url":"https://github.com/fedora-python/lxml_html_clean/releases/tag/0.4.5"},{"type":"WEB","url":"https://github.com/lxml/lxml/releases/tag/lxml-6.1.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49825.json"},{"type":"ADVISORY","url":"https://github.com/fedora-python/lxml_html_clean/security/advisories/GHSA-4jhm-jv67-739f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49825"},{"type":"FIX","url":"https://github.com/fedora-python/lxml_html_clean/commit/322357ac61c6cf80fcbaba53b4e92e31f3ded9f2"},{"type":"FIX","url":"https://github.com/lxml/lxml/commit/5927a6d5e851845140975d99b65461e255caaab0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-23T03:43:00.224485862Z"}}