CVE-2026-39824

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

CVE-2026-39824 is fixed in 3 products on 1 platform, first by OPENSUSE-SU-2026:21436-1, released July 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

3.3

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0011

1st percentile

This update for keybase-client fixes the following issues: Changes in keybase-client: - CVE-2026-39824: failure to reject ASCII-only Punycode-encoded labels

Where it's fixed

Product	Fixed in	Fix	Released
Linux
govulncheck-vulndb · opensuse-leap 16.0	0.0.20260723T184607-160000.1.1	OPENSUSE-SU-2026:21483-1	Jul 30, 2026
keybase-client · opensuse-leap 16.0	6.6.3-bp160.2.1	OPENSUSE-SU-2026:21492-1	Jul 29, 2026
rclone · opensuse-leap 16.0	1.74.4-bp160.1.1	OPENSUSE-SU-2026:21436-1	Jul 22, 2026

Details

Published
May 27, 2026
Weakness
Integer Overflow or Wraparound
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39824

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