CVE WatchOct 14, 2026

CVE-2023-4911

GNU C Library Buffer Overflow Vulnerability

CVSS

7.8

High

EPSS

63.8%

p99

KEV

YES

Nov 21, 2023

Exploit Today

0-100

Published: Oct 3, 2023 · Last modified: Oct 14, 2026 · CWE-122 · CWE-787

EPSS · 30d

63.8%EPSS · 30 days81.4%

2026-09-162026-10-14

KEV catalog record

Product

GNU / GNU C Library

Vulnerability

GNU C Library Buffer Overflow Vulnerability

Added to KEV

Nov 21, 2023

Remediate by

Dec 12, 2023

Known ransomware use

Summary description

GNU C Library's dynamic loader ld.so contains a buffer overflow vulnerability when processing the GLIBC_TUNABLES environment variable, allowing a local attacker to execute code with elevated privileges.

Required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Notes

This vulnerability affects a common open-source component, third-party library, or a protocol used by different products. Please check with specific vendors for information on patching status. For more information, please see: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=1056e5b4c3f2d90ed2b4a55f96add28da2f4c8fa, https://access.redhat.com/security/cve/cve-2023-4911, https://www.debian.org/security/2023/dsa-5514 ; https://nvd.nist.gov/vuln/detail/CVE-2023-4911

Technical description

A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the GLIBC_TUNABLES environment variable. This issue could allow a local attacker to use maliciously crafted GLIBC_TUNABLES environment variables when launching binaries with SUID permission to execute code with elevated privileges.

Official references

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