CVE-2025-68121

Published Feb 5, 2026

Last updated 3 days ago

Golang

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-68121 is a vulnerability found within the `crypto/tls` package of the Go programming language, addressed in Go versions 1.25.6 and 1.24.12. This vulnerability encompasses two primary issues. Firstly, the `Config.Clone` function was found to leak automatically generated session ticket keys, which could potentially enable unauthorized session resumptions across different configurations. Secondly, the vulnerability involved an oversight in how TLS session resumptions were handled on the server side. Specifically, when determining if a session could be resumed, only the expiration of the leaf certificate was checked, neglecting the expiration status of intermediate or root certificates within the full certificate chain. This allowed sessions to be resumed even if a critical certificate in the chain had expired.

Description: During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user calls Config.Clone and mutates the returned Config, or uses Config.GetConfigForClient. This can cause a client to resume a session with a server that it would not have resumed with during the initial handshake, or cause a server to resume a session with a client that it would not have resumed with during the initial handshake.
Source: security@golang.org
NVD status: Undergoing Analysis

Risk scores

CVSS 3.1

Type: Secondary
Base score: 4.8
Impact score: 2.5
Exploitability score: 2.2
Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Severity: MEDIUM

Weaknesses

134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-295

Hype score: Not currently trending

References