CVE-2026-123612

LowCVSS 2.3/10Last modified Nov 12, 2026

Description

rustls 0.23.44 and 0.23.45 contain an information disclosure vulnerability that sends application data buffered before the handshake completes to the client-facing server when Encrypted Client Hello is rejected. Because start_traffic() queues plaintext from ClientConnection::writer() before sending the ech_required alert, the authenticated public_name server receives data intended for the inner server.

Metrics

CVSS 3.1 2.3/10CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

Weakness enumeration

CWE-696

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
rustls	rustls	>= 0.23.44, < 0.23.46

References

Timeline

Published: Nov 8, 2026
Last modified: Nov 12, 2026
NVD status: Awaiting Analysis

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