Memory Leak Vulnerability in GNU C Library Affecting DNS Resolution
CVE-2026-0915

7.5HIGH

Key Information:

Vendor

The Gnu C Library

Status
Glibc
Vendor
CVE Published:
15 January 2026

What is CVE-2026-0915?

CVE-2026-0915 is a memory leak vulnerability found in the GNU C Library (glibc), a core component that supports various Unix/Linux operating systems. This library is essential for managing system calls and performing standard input/output operations. The vulnerability arises when the functions getnetbyaddr or getnetbyaddr_r are called with a specific configuration in the nsswitch.conf file defining DNS as the backend for network name resolution, particularly for queries directed at a zero-valued network. The exploitation of this vulnerability can lead to unintended disclosure of sensitive information, as it enables the leakage of stack contents to the DNS resolver configured by the system, potentially affecting the confidentiality and security of the information handled by affected applications.

Potential impact of CVE-2026-0915

  1. Data Leakage: The most significant impact of this vulnerability is the unintended exposure of stack memory contents, which may contain sensitive data such as user credentials, security tokens, or other private information that could be exploited by adversaries.

  2. System Integrity Risks: Organizations utilizing the affected versions of the GNU C Library may face integrity issues, as malicious actors could leverage the leaked data for further attacks, including privilege escalation or subsequent unauthorized access to more sensitive resources.

  3. Operational Disruption: The memory leak could lead to performance degradation in systems relying on the affected versions of glibc, potentially causing disruptions in service availability which can be particularly damaging for enterprises that depend on consistent uptime for critical operations.

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Affected Version(s)

glibc 2.0 <= 2.42

References

https://sourceware.org/bugzilla/show_bug.cgi?id=33802

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Igor Morgenstern, Aisle Research
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