CVE-2025-8027
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack, while Baseline-JIT read the entire 64 bits. Fixed in Firefox 141, Firefox ESR 115.26, 128.13, 140.1, and Thunderbird 141, 128.13, 140.1.
Risk Assessment
This could lead to incorrect JIT behavior, potentially allowing an attacker to compromise memory integrity or execute code.
Recommendation
Update Firefox or Thunderbird to a patched version. Monitor security updates.
Other vulnerabilities in Firefox
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Sandbox escape due to use-after-free in the Widget: Gtk component. Fixed in multiple Firefox and Thunderbird versions.
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Sandbox escape due to use-after-free in the DOM: Core & HTML component. Fixed in multiple Firefox and Thunderbird versions.
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Other issue in the DevTools component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.
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Sandbox escape due to use-after-free in the Preferences: Backend component. Fixed in Thunderbird 157 and Firefox 157.
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Sandbox escape due to use-after-free in the Disability Access APIs component. Fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
- CVE-2026-100794Critical
Vulnerability allows sandbox escape due to incorrect boundary conditions in the Internationalization component. It was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Original NVD description (English source)
On 64-bit platforms IonMonkey-JIT only wrote 32 bits of the 64-bit return value space on the stack. Baseline-JIT, however, read the entire 64 bits. This vulnerability was fixed in Firefox 141, Firefox ESR 115.26, Firefox ESR 128.13, Firefox ESR 140.1, Thunderbird 141, Thunderbird 128.13, and Thunderbird 140.1.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS