gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

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.

Source published

20 Mar 2026 19:59:06 UTC

Source modified

15 Oct 2026 01:12:10 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

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