CVE-2026-123611
LOW
NVD
CVSS Score
3.7
Severity
LOW
Published
Nov 08, 2026
Vendor
unknown
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.