CVE-2026-39824

Description

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.

CVSS Metrics

• v3.1•LOW•Score: 3.3CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Trends

Current EPSS score: 0.11%• Percentile: 2%

Techniques & Countermeasures

• CWE-190•Integer Overflow or Wraparound

  The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected Systems

• golang.org/x•sys

  < 0.44.0

• golang.org/x/sys•golang.org/x/sys/windows

  < 0.44.0

References (4)

• https://go.dev/issue/78916
• https://go.dev/cl/770080
• https://groups.google.com/g/golang-announce/c/6MMI8Lj-Atg
• https://pkg.go.dev/vuln/GO-2026-5024