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CVE-2026-42505— Invoking Encrypted Client Hello privacy leak 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Google公司开源的一种静态强类型、编译型、并发型,并具有垃圾回收功能的编程语言。 Google Go存在信息泄露漏洞，该漏洞源于在未加密的ClientHello中泄露预共享密钥标识，可能导致使用加密ClientHello的握手被被动网络观察者去匿名化。

AI Predicted 4.3 Difficulty: Easy EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1043

Affected Version Matrix 3

VendorProduct Version RangeStatus
Go standard library crypto/tls < 1.25.12 affected
1.26.0-0< 1.26.5 affected
1.27.0-0< 1.27.0-rc.2 affected
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I. Basic Information for CVE-2026-42505

Vulnerability Information
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Vulnerability Title
Invoking Encrypted Client Hello privacy leak in crypto/tls
Source: CVE Program / CVE List V5
Vulnerability Description
Handshakes which used Encrypted Client Hello could be de-anonymized by a passive network observer due to a disclosure of pre-shared key identities in the unencrypted client hello.
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 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google Go是美国Google公司开源的一种静态强类型、编译型、并发型,并具有垃圾回收功能的编程语言。 Google Go存在信息泄露漏洞，该漏洞源于在未加密的ClientHello中泄露预共享密钥标识，可能导致使用加密ClientHello的握手被被动网络观察者去匿名化。
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 ~ 1.25.12 -

II. Public POCs for CVE-2026-42505

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III. Intelligence Information for CVE-2026-42505

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Patches & Fixes for CVE-2026-42505 (1)

Vendor Advisories for CVE-2026-42505 (2)

Other References for CVE-2026-42505 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42505

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