CVE-2026-123612
Published:November 08, 2026
Updated:November 09, 2026
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.
Affected Packages
https://github.com/rustls/rustls.git (GITHUB):
Affected version(s) >=v/0.23.44 <v/0.23.46Fix Suggestion:
Update to version v/0.23.46rustls (RUST):
Affected version(s) >=0.23.44 <0.23.46Fix Suggestion:
Update to version 0.23.46Related Resources (13)
Do you need more information?
Contact UsCVSS v4
Base Score:
4.6
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
2.3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Incorrect Behavior Order
EPSS
Base Score:
0.11