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

Published Apr 28, 2026

Updated

The deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.2 and newer fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.

Affected Software

2 affected components

GNU GNU C Library>=2.2

GNU glibc>=2.2

Event History

Apr 28, 2026

CVE Published

via MITRE·11:58 AM

Data Sourced

via MITRE·11:58 AM

DescriptionWeakness

Data Sourced

via NVD·01:19 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

What is the severity of CVE-2026-5435?

CVE-2026-5435 is classified as a high severity vulnerability due to the potential for remote code execution through a buffer overflow.

How do I fix CVE-2026-5435?

To fix CVE-2026-5435, update to the latest version of the GNU C Library that addresses the buffer overflow issue.

What are the potential impacts of CVE-2026-5435?

The impacts of CVE-2026-5435 include the risk of denial of service or potentially arbitrary code execution on affected systems.

Which versions of GNU C Library are affected by CVE-2026-5435?

CVE-2026-5435 affects GNU C Library versions 2.2 and newer.

Is there a workaround for CVE-2026-5435?

Currently, the best practice is to apply the patch or upgrade to a secure version of the GNU C Library, as no specific workaround is recommended.

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