CVE-2026-39822

high

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.

References

https://github.com/kun9497/assay

https://pkg.go.dev/vuln/GO-2026-4970

https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc

https://go.dev/issue/79005

https://go.dev/cl/797880

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-42316

Details

Source: Mitre, NVD

Published: 2026-07-08

Updated: 2026-10-25

Named Vulnerability: GO-2026-4970Named Vulnerability: GHSA-xcgv-8mv7-v8c7

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:L/AC:L/Au:S/C:C/I:C/A:C

Severity: Medium

CVSS v3

Base Score: 7.8

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

Severity: High

EPSS

EPSS: 0.00232