CVE-2026-0915
Published: 15 January 2026
Summary
CVE-2026-0915 is a high-severity Use of Uninitialized Resource (CWE-908) vulnerability in Gnu Glibc. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique DNS (T1071.004); ranked at the 6.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
Threat & Defense at a Glance
Threat & Defense Details
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Vulnerability directly causes stack memory disclosure transmitted to the DNS resolver, enabling data exfiltration over DNS protocol.
NVD Description
Calling getnetbyaddr or getnetbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend for networks and queries for a zero-valued network in the GNU C Library version 2.0 to version 2.42 can leak stack contents to the configured DNS…
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resolver.
Deeper analysisAI
CVE-2026-0915, published on 2026-01-15, affects the GNU C Library (glibc) versions 2.0 through 2.42. The vulnerability arises when the functions getnetbyaddr or getnetbyaddr_r are called with an nsswitch.conf configuration that specifies the library's DNS backend for network lookups, and the query targets a zero-valued network. This results in stack contents being leaked to the configured DNS resolver. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) and maps to CWE-908.
Remote attackers can exploit this vulnerability with low complexity, no required privileges, and no user interaction. Exploitation involves triggering the affected functions under the specified nsswitch.conf and network query conditions, enabling high confidentiality impact through the disclosure of stack memory contents transmitted to the DNS resolver.
Advisories and patches are detailed in the Sourceware Bugzilla entry at https://sourceware.org/bugzilla/show_bug.cgi?id=33802 and the OSS-Security mailing list post at http://www.openwall.com/lists/oss-security/2026/01/16/6.
Details
- CWE(s)