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

2026-08-23

EPSS Score

0.80% (percentile: 54.8%)

Affected Products (11)

Open Source Software

• azl3 openssl 3.3.5-4 on Azure Linux 3.0
• azl3 cloud-hypervisor 48.0.246-4 on Azure Linux 3.0
• azl3 edk2 20240524git3e722403cd16-15 on Azure Linux 3.0
• azl3 nodejs24 24.13.0-3 on Azure Linux 3.0
• azl3 qemu 9.1.0-1 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
• cbl2 openssl 1.1.1k-39 on CBL Mariner 2.0
• azl3 nodejs24 24.14.1-1 on Azure Linux 3.0
• azl3 edk2 20240524git3e722403cd16-16 on Azure Linux 3.0

Other

• 21185-21692

Revision History

• 2026-04-11: Information published.
• 2026-04-12: Information published.
• 2026-04-13: Information published.
• 2026-04-14: Information published.
• 2026-04-15: Information published.
• 2026-04-23: Information published.
• 2026-04-29: Information published.
• 2026-04-29: Information published.
• 2026-04-30: Information published.
• 2026-05-31: Information published.
• 2026-06-01: Information published.
• 2026-06-02: Information published.
• 2026-08-23: Information published.