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GO-2025-3638 ServerHellos are accepted without checking TLS 1.3 downgrade canaries in github.com/refraction-networking/utls

🗓️ 24 Apr 2025 18:13:59Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 8 Views

TLS 1.3 downgrade canaries were unchecked in utls before version 1.7.0, enabling downgrade attacks.

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18 Feb 2026 23:56Current
6.9Medium risk
Vulners AI Score6.9
CVSS 3.16.5
EPSS0.00268
SSVC
8