CVE-2026-39822

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://go.dev/cl/797880 ↗

Additional information

• NVD record
• https://go.dev/cl/797880Patch
• https://go.dev/issue/79005Patch
• https://groups.google.com/g/golang-announce/c/OrmQE_Yp5ScPatch
• https://pkg.go.dev/vuln/GO-2026-4970Advisory