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

2026-09-05

EPSS Score

0.50% (percentile: 41.2%)

Affected Products (5)

Other

• 21384-17084
• 20935
• 20935-21692

Open Source Software

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

Security Updates (1)

• Security Update

Revision History

• 2026-04-22: Information published.
• 2026-04-25: Information published.
• 2026-06-03: Information published.
• 2026-08-09: Information published.
• 2026-09-05: Information published.
• 2026-09-05: Information published.