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CVE-2026-123611 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/rustls/rustls/security/advisories/GHSA-w44r-93j7-qv28	[email protected]
https://www.vulncheck.com/advisories/rustls-before-0.23.46-key-exchange-downgrade-via-unauthenticated-serverhello	[email protected]

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-757	Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')	[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

1 change record found show changes