Skip to content
Fencer Vulns
low 3.3

CVE-2026-39824 json

Invoking integer overflow in NewNTUnicodeString in golang.org/x/sys/windows

published 2026-05-22 5 mo ago modified 2026-07-23 3 mo ago also GO-2026-5024 , EUVD-2026-31498

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

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.

Patch / fix

  • go golang.org/x/sys 0.44.0
  • golang.org/x/sys golang.org/x/sys/windows 0.44.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
  • keybase-client openSUSE Leap 16.0 6.6.3-bp160.2.1
  • rclone openSUSE Leap 16.0 1.74.4-bp160.1.1
  • keybase-client openSUSE Tumbleweed 6.6.3-3.1
  • rclone openSUSE Tumbleweed 1.74.2-1.1

opensuse advisories openSUSE-SU-2026:21483-1openSUSE-SU-2026:21492-1openSUSE-SU-2026:21436-1openSUSE-SU-2026:11306-1openSUSE-SU-2026:10856-1

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected packages

ecosystem package affected fixed in
go golang.org/x/sys
<0.44.0
0.44.0

Affected products

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

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.