Vulnerability · Published May 22, 2026 · Assigned by Go
CVE-2026-39824Invoking integer overflow in NewNTUnicodeString in golang.org/x/sys/windows
Low 3.3
In plain English
A low-severity integer overflow in golang.org/x/sys/windows from golang.org/x/sys. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.3Low
Exploit odds (30 days)0.1%top 98.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | golang.org/x/sys | 0.44.0 | GO-2026-5024 |
| Ubuntu:22.04:LTS | golang-golang-x-sys | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:24.04:LTS | golang-golang-x-sys | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:25.10 | golang-golang-x-sys | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:26.04:LTS | golang-golang-x-sys | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:26.10 | golang-golang-x-sys | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:22.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:24.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:25.10 | google-guest-agent | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:26.04:LTS | google-guest-agent | no fix listed | UBUNTU-CVE-2026-39824 |
| Ubuntu:26.10 | google-guest-agent | no fix listed | UBUNTU-CVE-2026-39824 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| golang.org/x/sys | golang.org/x/sys/windows | 0 – before 0.44.0 |
Weakness: CWE-190 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N