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Description

Memory safety bugs present in Firefox ESR 115.32, Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147. 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 < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, and Thunderbird < 140.8.

PUBLISHED Reserved 2026-02-19 | Published 2026-02-24 | Updated 2026-02-25 | Assigner mozilla

Product status

Any version before 148
affected

Any version before 115.33
affected

Any version before 140.8
affected

Any version before 148
affected

Any version before 140.8
affected

Credits

Andrew McCreight, Christian Holler

References

bugzilla.mozilla.org/...i?bug_id=2015196%2C2016423%2C2016498 (Memory safety bugs fixed in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148)

www.mozilla.org/security/advisories/mfsa2026-13/

www.mozilla.org/security/advisories/mfsa2026-14/

www.mozilla.org/security/advisories/mfsa2026-15/

www.mozilla.org/security/advisories/mfsa2026-16/

www.mozilla.org/security/advisories/mfsa2026-17/

cve.org (CVE-2026-2793)

nvd.nist.gov (CVE-2026-2793)

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