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High7.6Vendor: MediumRed Hat Linux

High [CVE-2026-33636] Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion

This high-severity Red Hat Linux advisory covers CVE-2026-33636 affecting Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 1.

CVE-2026-33636 Published Mar 26, 2026
CVE-2026-33636
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Information disclosure and denial of service via out-of-bounds read/write in Neon palette expansion. Red Hat rates this moderate (CVSS 7.6).

Weakness: CWE-124. Affected package(s): libpng, firefox, java, thunderbird, discovery/discovery-ui-rhel9:1782756541, rhaiis/model-opt-cuda-rhel9:1780681984.

Resolved in Red Hat advisory RHSA-2026:11805 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 1; Red Hat Enterprise Linux 7.

Affected versions
  • libpng-2:1.6.37-15.el9_8.2
  • libpng-2:1.6.37-12.el9_0.3
  • libpng-2:1.6.37-12.el9_2.3
  • firefox-0:140.9.1-1.el8_4
  • firefox-0:140.9.1-1.el9_4
  • firefox-0:140.9.1-1.el8_6
  • firefox-0:140.9.1-1.el9_6
  • firefox-0:140.9.1-1.el8_8
  • firefox-0:140.9.1-1.el9_7
  • java-25-openjdk-1:25.0.3.0.9-1.el10_2
  • thunderbird-0:140.9.1-1.el8_10
  • discovery/discovery-ui-rhel9:1782756541

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

Fixed versions
  • RHSA-2026:11805

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-2026:11805 (`sudo dnf update` / `yum update`).

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

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