CVE-2026-28389: Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo

Overview

Severity

High (CVSS 7.5)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-11

Last Updated

2026-04-13

EPSS Score

0.06% (percentile: 18.2%)

Affected Products (9)

Open Source Software

• azl3 openssl 3.3.5-4 on Azure Linux 3.0
• azl3 rust 1.75.0-27 on Azure Linux 3.0
• azl3 rust 1.90.0-6 on Azure Linux 3.0

Other

• 19805-17086
• 21154-17084
• 21176-17084
• 21059-17084
• 20963-17084
• 21185-17086

Revision History

• 2026-04-11: Information published.
• 2026-04-12: Information published.
• 2026-04-13: Information published.