CVE-2026-49825
Missing xlink:href in lxml enables URL bypass and XSS via embedded SVG/MathML.
Is CVE-2026-49825 being exploited?
Not confirmed. CVE-2026-49825 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-49825?
CVE-2026-49825 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-49825?
Yes. A fix has been recorded for CVE-2026-49825. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-49825 affect?
CVE-2026-49825 affects lxml < 6.1.1, lxml_html_clean < 0.4.5, Python apps using lxml for HTML/SVG/MathML sanitization. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-49825?
Upgrade lxml>=6.1.1 and lxml_html_clean>=0.4.5; sanitize/validate SVG/MathML inputs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
URL bypass in embedded SVG/MathML leading to XSS, enabling script execution or phishing in apps rendering untrusted HTML.
Patch when possible
- affected< 6.1.1
- affected< 0.4.5
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.