CVE-2026-12328High· 8.1▾ TwilightMemory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these c…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 7.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.5%
Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. 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 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
firefox < 115.37.0firefox < 152.0firefox >= 140.0, < 140.12.0thunderbird < 152.0.0thunderbird >= 140.0, < 140.12.0Upgrade past the affected range:
firefox 140.12.0thunderbird 140.12.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-12291High· 8.8Use-after-free in the Networking: HTTP component
CVE-2026-12329Medium· 5.3Memory safety bug fixed in Thunderbird ESR 140.12
CVE-2026-12299Medium· 5.4JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12298Medium· 5.4Memory safety bug fixed in Firefox 152
CVE-2026-12297Critical· 9.6Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12296Critical· 9.6Sandbox escape in the Security: Process Sandboxing component