CVE-2026-4721
CVE-2026-4721: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh7.5
High [CVE-2026-4721] Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149
CVE-2026-4721Source published
Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Red Hat rates this important (CVSS 7.5). Weakness: CWE-825. Affected package(s): firefox, thunderbird. Resolved in Red Hat advisory RHSA-2026:6917 — update the affected packages (`sudo dnf update`).
- Affected products in this advisory
- Red Hat Enterprise Linux 10.0 Extended Update Support
- Red Hat Enterprise Linux 7 Extended Lifecycle Support
- Red Hat Enterprise Linux 8.2 Advanced Update Support
- Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
10 more entries in the full advisory.
- Source-reported affected versions
- firefox-0:140.9.0-1.el8_10
- thunderbird-0:140.9.0-1.el8_10
- firefox-0:140.9.0-1.el8_4
- firefox-0:140.9.0-1.el9_2
8 more entries in the full advisory.
- Source-reported fixed versions
- RHSA-2026:6917
- Mitigation guidance
- Update the affected package(s) to the fixed version shipped in RHSA-2026:6917 (`sudo dnf update` / `yum update`).
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