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Δ / VULNERABILITY RECORD

CVE-2026-4437.

Source-reported disclosure and enrichment record.

SEVERITY / CVSSMEDIUM / 5.9No severity score in this snapshot.
EXPLOITATION STATUSNot listed in the cached KEV catalogThis does not establish absence of exploitation.
RECORD STATUSMicrosoft vendor recordModified Aug 06, 2026

Disclosure summary

gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response

Source-reported weakness categories

CWE-125

Source-specific records & product guidance

Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.

Microsoft Security Updates (CVRF) · 2026-Mar

Open original source · Updated Aug 06, 2026

gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response

Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.

Microsoft maximum product score: 5.9

VendorProduct / associationVersion / bounds
Microsoft update guideazl3 glibc 2.38-19 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guideazl3 glibc 2.38-18 on Azure Linux 3.0 (MSRC status code 3)
Microsoft update guidecbl2 glibc 2.35-10 on CBL Mariner 2.0 (MSRC status code 3)

Vendor remediation references

  • CBL-Mariner Releases · build 2.38-19 · product IDs 21140-17084, 20895-17084
  • Vendor guidance · product IDs 21140-17084, 20895-17084

Original records & references

PUBLISHED 2026-03-21T21:01:18-04:00
MODIFIED 2026-08-06T21:03:13-04:00
INGESTED 2026-10-08T12:45:09-04:00