CVE-2025-8027
JavaScript engine only wrote partial return value to stack
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | mozilla |
| Product | firefox |
| Ecosystems | |
| Industries | Technology |
| Published | Jul 22, 2025 |
| Last Updated | Apr 13, 2026 |
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Affected Versions
Mozilla / Firefox
All versions affected Mozilla / Thunderbird
All versions affected References
bugzilla.mozilla.org: https://bugzilla.mozilla.org/show_bug.cgi?id=1968423 mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-56/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-57/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-58/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-59/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-61/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-62/ mozilla.org: https://www.mozilla.org/security/advisories/mfsa2025-63/ lists.debian.org: https://lists.debian.org/debian-lts-announce/2025/07/msg00016.html
Credits
Nan Wang