Inconsistent handling of O_CREATE|O_EXCL on Unix and Windows in os in syscall
Priority LOW 25CWE-59Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00327 25th percentileScored 2026-11-07
Fix Fixed syscall (Go standard library): 1.23.10, 1.24.4os (Go standard library): 1.23.10, 1.24.4
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Go standard library | syscall | before 1.23.10; 1.24.0-0 to before 1.24.4 | 1.23.10, 1.24.4 | Patch available | CNA |
| Go standard library | os | before 1.23.10; 1.24.0-0 to before 1.24.4 | 1.23.10, 1.24.4 | Patch available | CNA |
- syscall VendorGo standard library Affected before 1.23.10; 1.24.0-0 to before 1.24.4 Fixed in 1.23.10, 1.24.4 Patch available CNA
- os VendorGo standard library Affected before 1.23.10; 1.24.0-0 to before 1.24.4 Fixed in 1.23.10, 1.24.4 Patch available CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* | before 1.23.10; 1.24.0 to before 1.24.4 | Vulnerable | Go standard library |
| cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* | not specified by NVD | Running on | Microsoft |
- cpe:2.3:a:golang:go:*:*:*:*:*:*:*:* Versions before 1.23.10; 1.24.0 to before 1.24.4 Vulnerable ·Go standard library
- cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft
Remediation
- Fix · CNA syscall (Go standard library) Fixed in 1.23.10, 1.24.4
- Fix · CNA os (Go standard library) Fixed in 1.23.10, 1.24.4
Timeline
- 2026-10-02 Threatist record created from CVE-2025-0913
- 2026-10-03 Alias added: GHSA-jw54-c8rr-pjpq
References
More Go standard library Go vulnerabilities
- TI-2020-00578 Improper certificate validation in Microsoft Windows KEVCVSS 3.1HIGH 8.1
- TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
- TI-2018-05208 The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used… CVSS 3.1HIGH 8.8
- TI-2018-12083 Improper input validation in [UNKNOWN] golang CVSS 3.1HIGH 8.1
- TI-2024-16306 Mishandling of corrupt central directory record in archive/zip CVSS 3.1MEDIUM 5.5
- TI-2021-15910 Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2025-0913 · CVE Program
- CVE-2025-0913 · NVD
- FIRST EPSS
- GHSA-jw54-c8rr-pjpq · GitHub Advisory Database · CC BY 4.0
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