CVE-2026-3591: A stack use-after-return flaw in SIG(0) handling code may enable ACL bypass

Overview

Severity

Medium (CVSS 5.4)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Mar

Released

2026-03-29

Last Updated

2026-03-31

EPSS Score

0.02% (percentile: 6.3%)

Affected Products (1)

Open Source Software

• azl3 bind 9.20.18-1 on Azure Linux 3.0

Revision History

• 2026-03-29: Information published.
• 2026-03-30: Information published.
• 2026-03-31: Information published.