PT-2026-139893

CVE-2026-123612

Published

2026-10-14

Updated

2026-11-08

Description by

CVSS 4.0

4.6

Medium

MetricsAV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions rustls versions 0.23.44 through 0.23.45

Description An information disclosure issue occurs when Encrypted Client Hello (ECH) is rejected. The start traffic() function queues plaintext from ClientConnection::writer() before sending the ech required alert, causing the authenticated public name server to receive application data intended for the inner server.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploitability

Exploit

Impacts

Vendors

Affected products

Weakness enumeration

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CWE-696: Incorrect Behavior Order

Related identifiers

CVE-2026-123612

GHSA-VP88-798V-H67F