CVE-2026-39822

Root escape via symlink plus trailing slash in os

State: Published
Severity: 7.8 High
Published: Jul 8, 2026
Updated: Jul 8, 2026
Reserved: Apr 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-61 UNIX Symbolic Link (Symlink) Following

Affected Products

Product	Versions
osGo standard library	before 1.25.12Affected 1.26.0-0 to before 1.26.5Affected 1.27.0-0 to before 1.27.0-rc.2Affected

References

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