CVE-2026-123611 - rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello

CVE-2026-123611 - rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello

https://cvefeed.io/rssfeed/latest.atom / Sun, 11/08/2026 - 04:52
CVE ID :CVE-2026-123611
Published : Nov. 8, 2026, 1:38 a.m. | 18 minutes ago
Description :rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.
Severity: 6.3 | MEDIUM
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