CVE-2026-5450: scanf %mc off-by-one heap buffer overflow

Overview

Severity

Low (CVSS 3.1)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-22

Last Updated

2026-04-25

EPSS Score

0.07% (percentile: 22.2%)

Affected Products (2)

Open Source Software

• azl3 glibc 2.38-19 on Azure Linux 3.0
• cbl2 glibc 2.35-10 on CBL Mariner 2.0

Revision History

• 2026-04-22: Information published.
• 2026-04-25: Information published.