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CVE-2026-39824VulnerabilityPublished Updated

NewNTUnicodeString · Invoking Integer Overflow

Affects MicrosoftSource GCVE Database

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Authoritative record:CVE-2026-39824· Low 3.3

Not known to be exploited · CVSS 3.3 Low : upgrade to 0.44.0 when convenient.

Data as of 31 Oct 2026, 08:37 UTC

CVSS 3.1 base score
3.3Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.44.0
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade golang.org/x/sys/windows to 0.44.0.

Affected software

ProductAffectedFixed in
golang.org/x/sysgolang.org/x/sys/windowsAffected
  • <0.44.0
Fixed in
  • 0.44.0
Gogolang.org/x/sys/windowspkg:golang/golang.org/x/sys/windowsOther threatsAffected
  • =0
Fixed in–
Gogolang.org/x/sys/windowspkg:golang/golang.org/x/sys/windowsOther threatsAffected
  • <0.44.0
Fixed in
  • 0.44.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

If you cannot patch yet, cautious use or avoidance of the affected function may be prudent, but no specific vendor recommendations are provided.

Description

CVE-2026-39824 is a vulnerability involving an integer overflow in the NewNTUnicodeString function within the golang.org/x/sys/windows package. The issue is identified as CWE-190, which relates to integer overflow or wraparound. The affected version is exactly version 3.0. No CVSS score or detailed impact information is provided, and no known exploits or patches are currently documented.

References

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