CVE-2025-6436

Description

Memory safety bugs present in Firefox 139 and Thunderbird 139. 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 affects Firefox < 140.

Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozilla

Problem types

Memory safety bugs fixed in Firefox 140 and Thunderbird 140

Product status

Any version before 140
affected

Credits

Andrew McCreight, Gabriele Svelto, Beth Rennie (she/her), the Mozilla Fuzzing Team

References

bugzilla.mozilla.org/...960948%2C1966187%2C1966505%2C1970764 (Memory safety bugs fixed in Firefox 140 and Thunderbird 140)

www.mozilla.org/security/advisories/mfsa2025-51/

cve.org (CVE-2025-6436)

nvd.nist.gov (CVE-2025-6436)

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