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Vulnerabilities

CVE-2026-123611 | BDVDB-2026-401968 Detail

rustlsrustls

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.

Impact#

Per CVSS v3.1: confidentiality impact low, integrity impact none, availability impact none. Attack vector: network.

Weaknesses#

  • CWE-757 Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

References#

Exploit#

No public exploit known

History#

  1. Version 1Record published in the CVE List.