PatchTheCVEutls vulnerabilities and fixes
Recent CVEs affecting utls, with upgrade or downgrade steps. 2 tracked.
utls has 2 tracked vulnerabilities, 0 critical. A fixed release or vendor patch exists for 2. Most recent: 2026-02-20. Highest priority: CVE-2026-26994 (score 33/100).
- CVE-2026-27017 MEDIUM 5.3 UPGRADE uTLS is a fork of crypto/tls, created to customize ClientHello for fingerprinting resistance while still using
- CVE-2026-26994 MEDIUM 6.5 UPGRADE uTLS is a fork of crypto/tls, created to customize ClientHello for fingerprinting resistance while still using
FAQ
How do I fix utls 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 utls being exploited right now?
None of the tracked utls CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.
Which utls CVE should I patch first?
CVE-2026-26994 currently ranks highest (33/100): uTLS is a fork of crypto/tls, created to customize ClientHello for fingerprinting resistance while still using.