{"id":"CVE-2026-123611","published":"2026-11-08T02:16:56.440","lastModified":"2026-11-08T02:16:56.440","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.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","cwes":["CWE-757"],"vendors":[],"products":[],"references":[{"url":"https://github.com/rustls/rustls/security/advisories/GHSA-w44r-93j7-qv28","tags":[]},{"url":"https://www.vulncheck.com/advisories/rustls-before-0.23.46-key-exchange-downgrade-via-unauthenticated-serverhello","tags":[]}],"exploitRefs":[{"url":"https://github.com/rustls/rustls/security/advisories/GHSA-w44r-93j7-qv28","tags":[]}],"hasPoc":true,"ai":null}