High7.5Red Hat & Ubuntu Linux
Uninitialized memory in the Audio/Video: Web Codecs component
CVE-2026-6751 Published Apr 21, 2026
CVE-2026-6751
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
Uninitialized memory in the Audio/Video: Web Codecs component. Red Hat rates this important (CVSS 7.5). Weakness: CWE-824. Affected package(s): thunderbird, firefox. Resolved in Red Hat advisory RHSA-2026:10757 — update the affected packages (`sudo dnf update`).
Affected versions
- thunderbird-0:140.10.0-1.el8_10
- firefox-0:140.10.0-1.el10_1
- firefox-0:140.10.0-1.el9_8
- firefox-0:140.10.0-1.el10_0
- firefox-0:140.10.0-1.el10_2
- thunderbird-0:140.10.0-1.el8_4
- firefox-0:140.10.0-1.el9_0
- thunderbird-0:140.10.0-1.el9_2
- firefox-0:140.10.0-1.el9_2
- firefox-0:140.10.0-1.el8_4
- thunderbird-0:140.10.0-1.el9_0
- firefox-0:140.10.0-1.el9_4
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Fixed versions
- RHSA-2026:10757
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:10757 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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