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CVE-2026-4438

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-4438

Severity

5.4

Medium

CVSS V3

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Summary

gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames

Description

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.

References

  • https://nvd.nist.gov/vuln/detail/CVE-2026-4438
  • https://github.com/advisories/GHSA-935r-rfch-9mr7
  • https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4438.json
  • https://sourceware.org/bugzilla/show_bug.cgi?id=34015
  • https://cert-portal.siemens.com/productcert/html/ssa-082556.html

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