CVE-2026-0915: getnetbyaddr and getnetbyaddr_r leak stack contents to DNS resovler

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-15 · updated 2026-06-17
Weakness: CWE-908

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 resolver.

Affected products

GNU C Library (glibc): from 2.0 through 2.42

References

https://sourceware.org/bugzilla/show_bug.cgi?id=33802
http://www.openwall.com/lists/oss-security/2026/01/16/6
https://sourceware.org/bugzilla/show_bug.cgi?id=33802

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