SB2026100230 - Buffer Over-read in GNU C Library

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Main Vulnerability Database SB2026100230

SB2026100230 - Buffer Over-read in GNU C Library

Published: October 2, 2026

Security Bulletin ID SB2026100230
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Buffer Over-read (CVE-ID: CVE-2026-6238)

CWE-ID: CWE-126 - Buffer over-read

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to crash the target application or read uninitialized data.

The vulnerability exists due to deprecated functions ns_printrrf, ns_printrr and fp_nquery in the GNU C Library version 2.0.1 to version 2.43 fail to validate the RDATA content against the RDATA length in a DNS response when processing A6, CERT, LOC, TKEY or TSIG records. A remote attacker can craft a DNS response, causing a target application to crash or read uninitialized memory.


Remediation

Install update from vendor's website.

References