PatchTheCVElibexpat vulnerabilities and fixes
Recent CVEs affecting libexpat, with upgrade or downgrade steps. 1 tracked.
libexpat has 1 tracked vulnerability, 0 critical. A fixed release or vendor patch exists for 1. Most recent: 2026-08-18. Highest priority: CVE-2026-66046 (score 50/100).
- CVE-2026-66046 HIGH 7.5 UPGRADE Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in t
FAQ
How do I fix libexpat vulnerabilities?
Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.
Is libexpat being exploited right now?
None of the tracked libexpat CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which libexpat CVE should I patch first?
CVE-2026-66046 currently ranks highest (50/100): Expat through 2.8.3 contains a denial of service vulnerability caused by quadratic algorithmic complexity in t.