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.
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References
History
Sun, 08 Nov 2026 01:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello | |
| First Time appeared |
Rustls Project
Rustls Project rustls |
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| Weaknesses | CWE-757 | |
| CPEs | cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Rustls Project
Rustls Project rustls |
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| References |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-08T01:38:36.176Z
Reserved: 2026-11-06T01:02:39.794Z
Link: CVE-2026-123611
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Redhat
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Weaknesses