What’s Vulnerable › Vulnerabilities

CVE-2025-0913: Inconsistent handling of O_CREATE|O_EXCL on Unix and Windows in os in syscall

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-11 · updated 2026-06-17
• Weakness: CWE-59

Description

os.OpenFile(path, os.O_CREATE|O_EXCL) behaved differently on Unix and Windows systems when the target path was a dangling symlink. On Unix systems, OpenFile with O_CREATE and O_EXCL flags never follows symlinks. On Windows, when the target path was a symlink to a nonexistent location, OpenFile would create a file in that location. OpenFile now always returns an error when the O_CREATE and O_EXCL flags are both set and the target path is a symlink.

Affected products

• Go: before 1.23.10; from 1.24.0 before 1.24.4 — fixed in 1.23.10, 1.24.4

How to fix

Upgrade to a fixed version: Go 1.23.10, 1.24.4. Check the vendor advisory for mitigations.

References

• https://go.dev/cl/672396
• https://go.dev/issue/73702
• https://groups.google.com/g/golang-announce/c/ufZ8WpEsA3A
• https://pkg.go.dev/vuln/GO-2025-3750

Get alerted when CVE-2025-0913 or the next vulnerability affects your stack