SB2026100204 - Out-of-bounds write in GNU C Library

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Main Vulnerability Database SB2026100204

SB2026100204 - Out-of-bounds write in GNU C Library

Published: October 2, 2026

Security Bulletin ID SB2026100204
CSH Severity
Medium
Patch available
NO
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds write (CVE-ID: CVE-2026-5435)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to  deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library fail to enforce the caller-supplied buffer length, and can result in an out-of-bounds write when printing TSIG records.. A remote attacker can create a specially crafted file, trick the victim into opening it using the affected software, trigger an out-of-bounds write and execute arbitrary code on the target system.


Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References