PT-2026-56478 · Go Standard Library+1 · Os+1

Mundur · Published 2026-07-07 · Updated 2026-07-08 · CVE-2026-39822

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions The product name cannot be determined (affected versions not specified)

Description On Unix systems, opening a file in an os.Root improperly follows symbolic links to locations outside of the Root. This occurs when the final path component of a path is a symbolic link and the path ends in a forward slash (/). For instance, calling root.Open("symlink/") allows access to the target of the symbolic link even if it points outside the designated root directory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Weakness Enumeration

CWE-61

Related Identifiers

CVE-2026-39822

GO-2026-4970

Affected Products

Os

Stdlib

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-39822 · Security Note
• https://osv.dev/vulnerability/GO-2026-4970 · Vendor Advisory
• https://go.dev/cl/797880 · Note
• https://pkg.go.dev/vuln/GO-2026-4970 · Note
• https://go.dev/issue/79005 · Note
• https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc · Note