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Medium4.0Vendor: LowRed Hat Linux

Medium [CVE-2026-4438] Invalid DNS hostname returned via gethostbyaddr functions

This medium-severity Red Hat Linux advisory covers CVE-2026-4438 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1, glibc-main.

CVE-2026-4438 Published Mar 20, 2026
CVE-2026-4438
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Invalid DNS hostname returned via gethostbyaddr functions. Red Hat rates this low (CVSS 4).

Weakness: CWE-838. Affected package(s): glibc-main, rhui5/haproxy-rhel9:1781525671, insights-proxy/insights-proxy-container-rhel9:1780420428, glibc, rhui5/installer-rhel9:1781525693, costmanagement/costmanagement-metrics-rhel9-operator:1780946239.

Resolved in Red Hat advisory RHSA-2026:19061 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 1.

Affected versions
  • glibc-main-2.42-11.1.hum1
  • rhui5/haproxy-rhel9:1781525671
  • insights-proxy/insights-proxy-container-rhel9:1780420428
  • glibc-0:2.34-270.el9_8
  • rhui5/installer-rhel9:1781525693
  • costmanagement/costmanagement-metrics-rhel9-operator:1780946239
  • glibc-0:2.39-121.el10_2
  • rhui5/cds-rhel9:1781525684
  • discovery/discovery-ui-rhel9:1782166952
  • discovery/discovery-server-rhel9:1782159791
  • rhui5/rhua-rhel9:1781525739

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:19061

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:19061 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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