CVE-2026-4721

CRITICAL

RHSA-2026:6342 Red Hat Security Advisory: thunderbird security update

Details

CVSS v3: 9.8
NVD published: 2026-03-24 13:16:07
EPSS: <0.1% probability · 6.1th percentile — 2026-03-31
Affected versions: cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
Summary: Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.
Remediation: Not available in our cache.
Exploit info: Not available in our cache.

TopVuln sends digest emails with high-risk CVE picks across multiple authoritative sources—curated with EPSS and AI. Choose daily per-stream emails and optional weekly or monthly roundups.

Subscribe — free email digest or paid plan

Information is aggregated from multiple authoritative sources for convenience; verify with NVD and vendors before operational decisions.