CVE-2025-8027

Description

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.

PUBLISHED Reserved 2025-07-22 | Published 2025-07-22 | Updated 2026-04-13 | Assigner mozilla

Product status

Credits

Nan Wang

References

lists.debian.org/debian-lts-announce/2025/07/msg00016.html

bugzilla.mozilla.org/show_bug.cgi?id=1968423

www.mozilla.org/security/advisories/mfsa2025-56/

www.mozilla.org/security/advisories/mfsa2025-57/

www.mozilla.org/security/advisories/mfsa2025-58/

www.mozilla.org/security/advisories/mfsa2025-59/

www.mozilla.org/security/advisories/mfsa2025-61/

www.mozilla.org/security/advisories/mfsa2025-62/

www.mozilla.org/security/advisories/mfsa2025-63/

cve.org (CVE-2025-8027)

nvd.nist.gov (CVE-2025-8027)

Download JSON