CVE-2026-4438

5.4 mediumEPSS 0.3%

Medium (5.4) in gnu glibc. EPSS 0.3% chance of exploitation in the next 30 days.

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.

Severity

CVSS 3.1

5.4 medium

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.3% chance of exploitation in the next 30 days; higher than 26% of CVEs (scores of 2026-10-31)
CWEs: CWE-20, CWE-88
Published: 2026-03-20
Modified: 2026-07-14
Record from: the NVD, synced 2026-10-19

Affected

gnu:glibc

References

https://sourceware.org/bugzilla/show_bug.cgi?id=34015
https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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