CVE-2026-39822

HIGH CVSS 3.1: 7.8 EPSS 0.23%
Updated Sep 17, 2026
Golang
Parameter Value
CVSS 7.8 (HIGH)
Affected Versions 1.26.0 — 1.26.5
Fixed In 1.25.12
Type CWE-61 (UNIX Symlink Following)
Vendor Golang
Public PoC No

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.

Attack Parameters

Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service

CVSS Vector v3.1

Vulnerable Products 3

Configuration From (including) Up to (excluding)
Golang Go
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
1.25.12
Golang Go
cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*
1.26.0 1.26.5
Golang Go
cpe:2.3:a:golang:go:1.27:rc1:*:*:*:*:*:*