CVE-2026-12295Critical· 9.6▾ AbyssalPoC availableSandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 52.8 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
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
0.4%
1 GitHub repo
Sandbox escape in the DOM: Navigation component. 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 < 152.0.0firefox >= 128.0, < 140.12.0thunderbird < 140.12.0thunderbird < 152.0.0Upgrade past the affected range:
firefox 140.12.0thunderbird 152.0.0Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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
CVE-2026-12294Critical· 9.6Sandbox escape in the DOM: Workers component
CVE-2026-12329Medium· 5.3Memory safety bug fixed in Thunderbird ESR 140.12
CVE-2026-12328High· 8.1Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151
CVE-2026-12299Medium· 5.4JIT miscompilation in the DOM: Core & HTML component