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CVE-2026-39822— Root escape via symlink plus trailing slash in os

Quick assessment

Affected
Go standard library os
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 1.25.12之前版本、1.26.5之前版本的1.26.0-0版本和1.27.0-rc.2之前版本的1.27.0-0版本存在后置链接漏洞，该漏洞源于在Unix系统上打开os.Root中的文件时，当路径的最后一个组件是符号链接且路径以斜杠结尾时，会错误地跟随指向Root之外的符号链接，可能导致攻击者访问限制外的文件。

AI Predicted 7.8 Difficulty: Easy EPSS 0.23% · P13

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 3

VendorProduct Version RangeStatus
Go standard library os < 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-2026-39822

Vulnerability Information
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Vulnerability Title
Root escape via symlink plus trailing slash in os
Source: CVE Program / CVE List V5
Vulnerability Description
On Unix systems, opening a file in an os.Root improperly follows symlinks to locations outside of the Root when the final path component of the a path is a symbolic link and the path ends in /. For example, 'root.Open("symlink/")' will open "symlink" even when "symlink" is a symbolic link pointing outside of the root.
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 后置链接漏洞
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 1.25.12之前版本、1.26.5之前版本的1.26.0-0版本和1.27.0-rc.2之前版本的1.27.0-0版本存在后置链接漏洞，该漏洞源于在Unix系统上打开os.Root中的文件时，当路径的最后一个组件是符号链接且路径以斜杠结尾时，会错误地跟随指向Root之外的符号链接，可能导致攻击者访问限制外的文件。
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 os 0 ~ 1.25.12 -

II. Public POCs for CVE-2026-39822

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III. Intelligence Information for CVE-2026-39822

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Patches & Fixes for CVE-2026-39822 (1)

Vendor Advisories for CVE-2026-39822 (3)

IV. Related Vulnerabilities

Same product: os
Same vendor: Go standard library

V. Comments for CVE-2026-39822

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