What’s Vulnerable › Vulnerabilities

CVE-2025-22873: Improper access to parent directory of root in os

• Severity: low (CVSS 3.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-04 · updated 2026-06-17
• Weakness: CWE-23

Description

It was possible to improperly access the parent directory of an os.Root by opening a filename ending in "../". For example, Root.Open("../") would open the parent directory of the Root. This escape only permits opening the parent directory itself, not ancestors of the parent or files contained within the parent.

Affected products

• Go: before 1.23.9; from 1.24.0 before 1.24.3 — fixed in 1.23.9, 1.24.3

How to fix

Upgrade to a fixed version: Go 1.23.9, 1.24.3. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/670036
• https://go.dev/issue/73555
• https://groups.google.com/g/golang-announce/c/UZoIkUT367A/m/5WDxKizJAQAJ
• https://pkg.go.dev/vuln/GO-2026-4403
• http://www.openwall.com/lists/oss-security/2025/05/06/2

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