Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-5734

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 affects Firefox < 149.0.2, Firefox ESR < 140.9.1, Thunderbird < 149.0.2, and Thunderbird < 140.9.1.
Exploit prediction scoring system (EPSS) score
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-5734


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