CVE-2026-46243: smb: client: reject userspace cifs.spnego descriptions

Overview

Severity

High (CVSS 7.8)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Status

Not Exploited

Patch Tuesday

2026-Jun

Released

2026-06-03

Last Updated

2026-06-28

EPSS Score

0.38% (percentile: 31.2%)

Detection & Weaponization (1 sources)

Maturity: Exploit

• GitHub PoC: 4 repositories

Affected Products (2)

Other

• 21443-17084
• 21344-17084

Revision History

• 2026-06-03: Information published.
• 2026-06-17: Information published.
• 2026-06-24: Information published.
• 2026-06-28: Information published.