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Vulnerability Details CVE-2026-4438

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 8.5%
CVSS Severity
CVSS v3 Score 5.4
Products affected by CVE-2026-4438
  • Gnu » Glibc » Version: 2.34
    cpe:2.3:a:gnu:glibc:2.34
  • Gnu » Glibc » Version: 2.34.9000
    cpe:2.3:a:gnu:glibc:2.34.9000
  • Gnu » Glibc » Version: 2.35
    cpe:2.3:a:gnu:glibc:2.35
  • Gnu » Glibc » Version: 2.35.9000
    cpe:2.3:a:gnu:glibc:2.35.9000
  • Gnu » Glibc » Version: 2.36
    cpe:2.3:a:gnu:glibc:2.36
  • Gnu » Glibc » Version: 2.36.113
    cpe:2.3:a:gnu:glibc:2.36.113
  • Gnu » Glibc » Version: 2.36.9000
    cpe:2.3:a:gnu:glibc:2.36.9000
  • Gnu » Glibc » Version: 2.37
    cpe:2.3:a:gnu:glibc:2.37
  • Gnu » Glibc » Version: 2.37.38
    cpe:2.3:a:gnu:glibc:2.37.38
  • Gnu » Glibc » Version: 2.37.9000
    cpe:2.3:a:gnu:glibc:2.37.9000
  • Gnu » Glibc » Version: 2.38
    cpe:2.3:a:gnu:glibc:2.38
  • Gnu » Glibc » Version: 2.38.19
    cpe:2.3:a:gnu:glibc:2.38.19
  • Gnu » Glibc » Version: 2.38.9000
    cpe:2.3:a:gnu:glibc:2.38.9000
  • Gnu » Glibc » Version: 2.39
    cpe:2.3:a:gnu:glibc:2.39
  • Gnu » Glibc » Version: 2.39.9000
    cpe:2.3:a:gnu:glibc:2.39.9000
  • Gnu » Glibc » Version: 2.40
    cpe:2.3:a:gnu:glibc:2.40
  • Gnu » Glibc » Version: 2.40.9000
    cpe:2.3:a:gnu:glibc:2.40.9000
  • Gnu » Glibc » Version: 2.41
    cpe:2.3:a:gnu:glibc:2.41
  • Gnu » Glibc » Version: 2.41.9000
    cpe:2.3:a:gnu:glibc:2.41.9000


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