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High7.5Vendor: MediumRed Hat Linux

High [CVE-2026-28390] Denial of Service due to NULL pointer dereference in CMS EnvelopedData processing

This high-severity Red Hat Linux advisory covers CVE-2026-28390 affecting Red Hat Enterprise Linux 1, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

CVE-2026-28390 Published Apr 7, 2026
CVE-2026-28390
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service due to NULL pointer dereference in CMS EnvelopedData processing. Red Hat rates this moderate (CVSS 7.5).

Weakness: CWE-476. Affected package(s): openssl-main, rhui5/installer-rhel9:1781525693, openssl, compat-openssl10, rhui5/cds-rhel9:1781525684, discovery/discovery-ui-rhel9:1782166952.

Resolved in Red Hat advisory RHSA-2026:35869 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.

Affected versions
  • openssl-main-3.5.6-0.3.hum1
  • rhui5/installer-rhel9:1781525693
  • openssl-1:3.5.5-3.el10_2
  • compat-openssl10-1:1.0.2o-4.el8_10.2
  • rhui5/cds-rhel9:1781525684
  • discovery/discovery-ui-rhel9:1782166952
  • discovery/discovery-server-rhel9:1782159791
  • openssl-main-3.5.6-0.1.hum1
  • rhui5/rhua-rhel9:1781525739
  • rhui5/haproxy-rhel9:1781525671
  • compat-openssl11-1:1.1.1k-5.el9_8.3
  • insights-proxy/insights-proxy-container-rhel9:1780420428

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

Fixed versions
  • RHSA-2026:35869

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-2026:35869 (`sudo dnf update` / `yum update`).

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

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