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High7.5Vendor: MediumRed Hat Linux

High [CVE-2026-40890] Denial of Service via malformed Markdown input

This high-severity Red Hat Linux advisory covers CVE-2026-40890 affecting multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779925273, multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118, multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753.

CVE-2026-40890 Published Apr 21, 2026
CVE-2026-40890
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service via malformed Markdown input. Red Hat rates this moderate (CVSS 7.5).

Weakness: CWE-1286.

Affected package(s): multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779925273, multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118, multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753, multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779579439, rhacm2/acm-grafana-rhel9:1780677003.

Resolved in Red Hat advisory RHSA-2026:21769 — update the affected packages (`sudo dnf update`).

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

Affected versions
  • multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779925273
  • multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1780167118
  • multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1778867753
  • multicluster-globalhub/multicluster-globalhub-grafana-rhel9:1779579439
  • rhacm2/acm-grafana-rhel9:1780677003

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

Fixed versions
  • RHSA-2026:21769

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-2026:21769 (`sudo dnf update` / `yum update`).

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

Discussion(0)

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