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CVE-2025-68121— Unexpected session resumption in crypto/tls

Quick assessment

Affected
Go standard library crypto/tls
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于crypto/tls会话恢复期间，如果底层Config的ClientCAs或RootCAs字段在初始握手和恢复握手之间发生变更，可能导致恢复握手在不该成功时成功，造成客户端或服务器与不应恢复会话的对端恢复会话。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.86% · P57

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 3

VendorProduct Version RangeStatus
Go standard library crypto/tls < 1.24.13 affected
1.25.0-0< 1.25.7 affected
1.26.0-rc.1< 1.26.0-rc.3 affected
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I. Basic Information for CVE-2025-68121

Vulnerability Information
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Vulnerability Title
Unexpected session resumption in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Google Go 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国谷歌（Google）公司的一种静态强类型、编译型、并发型，并具有垃圾回收功能的编程语言。 Google Go存在安全漏洞，该漏洞源于crypto/tls会话恢复期间，如果底层Config的ClientCAs或RootCAs字段在初始握手和恢复握手之间发生变更，可能导致恢复握手在不该成功时成功，造成客户端或服务器与不应恢复会话的对端恢复会话。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Go standard library crypto/tls 0 ~ 1.24.13 -

II. Public POCs for CVE-2025-68121

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III. Intelligence Information for CVE-2025-68121

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Patches & Fixes for CVE-2025-68121 (1)

Vendor Advisories for CVE-2025-68121 (2)

IV. Related Vulnerabilities

Same product: crypto/tls
Same vendor: Go standard library

V. Comments for CVE-2025-68121

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