CVE-2026-31789: Heap Buffer Overflow in Hexadecimal Conversion

Overview

Severity

Medium (CVSS 4.7)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-09

Last Updated

2026-04-30

EPSS Score

0.01% (percentile: 0.7%)

Affected Products (11)

Open Source Software

• azl3 openssl 3.3.5-4 on Azure Linux 3.0
• azl3 nodejs24 24.14.1-2 on Azure Linux 3.0
• azl3 qemu 9.1.0-5 on Azure Linux 3.0
• cbl2 cloud-hypervisor-cvm 38.0.72.2-5 on CBL Mariner 2.0
• azl3 cloud-hypervisor 48.0.246-4 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
• azl3 nodejs24 24.14.1-1 on Azure Linux 3.0
• azl3 rust 1.90.0-7 on Azure Linux 3.0

Revision History

• 2026-04-09: Information published.
• 2026-04-10: Information published.
• 2026-04-11: Information published.
• 2026-04-14: Information published.
• 2026-04-15: Information published.
• 2026-04-29: Information published.
• 2026-04-30: Information published.