Open File Behavior Discrepancy in Go on Unix and Windows Systems
CVE-2025-0913

5.5MEDIUM

Key Information:

Vendor

Go Standard Library

Status
Syscall
Os
Vendor
CVE Published:
11 June 2025

What is CVE-2025-0913?

This vulnerability pertains to the behavior of the Go programming language's OpenFile function when handling dangling symlinks across different operating systems. On Unix systems, using OpenFile with the O_CREATE and O_EXCL flags does not follow symlinks, ensuring that it behaves predictably. However, on Windows, it allows the creation of a file in a location pointed to by a symlink even if that location is invalid. The updated behavior now ensures that OpenFile returns an error when both O_CREATE and O_EXCL flags are set for a symlink, aligning the functionality across platforms and enhancing overall reliability.

Affected Version(s)

os windows 0 < 1.23.10

os windows 1.24.0-0 < 1.24.4

syscall windows 0 < 1.23.10

References

https://go.dev/cl/672396
https://go.dev/issue/73702
https://groups.google.com/g/golang-announce/c/ufZ8WpEsA3A

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Junyoung Park and Dong-uk Kim of KAIST Hacking Lab
.
CVE-2025-0913 : Open File Behavior Discrepancy in Go on Unix and Windows Systems