CVE-2026-5435: Potential buffer overflow in ns_sprintrrf TSIG handling path

Overview

Severity

High (CVSS 8.6)

CVSS Vector

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

Exploit Status

Not Exploited

Patch Tuesday

2026-Apr

Released

2026-04-29

Last Updated

2026-06-03

EPSS Score

0.05% (percentile: 15.9%)

Affected Products (3)

Open Source Software

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

Other

• 21384-17084

Revision History

• 2026-04-29: Information published.
• 2026-04-30: Information published.
• 2026-06-03: Information published.