TNCVE-2026-5734 — Vulnetix

TNCVE-2026-5734 PUBLISHED

Memory safety bugs present in Firefox ESR 140.9.0, Thunderbird ESR 140.9.0, Firefox 149.0.1 and Thunderbird 149.0.1. 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 was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.

Timeline

Apr 7, 2026 CVE Published

References

Tenable: CVE-2026-5734 advisory

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