CVE-2026-39824: Invoking integer overflow in NewNTUnicodeString in golang.org/x/sys/windows
CSIRTS triage
- What
- An integer overflow in NewNTUnicodeString allows arbitrary memory corruption.
- Who is affected
- Go applications using golang.org/x/sys/windows library with affected versions.
- Urgency
- Critical severity (CVSS 9.8); integer overflow leading to memory corruption, not currently exploited but highly dangerous.
- Action
- Upgrade golang.org/x/sys/windows to a patched version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39824
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-398240.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-39824 | coverage & exploitation status | NVD · CVE.org |
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