Invoking integer overflow in NewNTUnicodeString in golang.org/x/sys/windows
Priority LOW 15CWE-190Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.
Summary
NewNTUnicodeString does not check for string length overflow. When provided with a string that overflows the maximum size of a NTUnicodeString (a 16-bit number of bytes), it returns a truncated string rather than an error.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00114 1st percentileScored 2026-11-07
Fix Fixed golang.org/x/sys/windows (golang.org/x/sys): 0.44.0
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 |
|---|---|---|---|---|---|
| golang.org/x/sys | golang.org/x/sys/windows | before 0.44.0 | 0.44.0 | Patch available | CNA |
- golang.org/x/sys/windows Vendorgolang.org/x/sys Affected before 0.44.0 Fixed in 0.44.0 Patch available CNA
Remediation
- Fix · CNA golang.org/x/sys/windows (golang.org/x/sys) Fixed in 0.44.0
Timeline
- 2026-10-02 Threatist record created from CVE-2026-39824
- 2026-10-03 Alias added: GHSA-4vpj-hr3r-4gpg
References
Sources
- CVE-2026-39824 · CVE Program
- CVE-2026-39824 · NVD
- FIRST EPSS
- GHSA-4vpj-hr3r-4gpg · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences