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Description

Memory safety bugs present in Firefox 138 and Thunderbird 138. 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 was fixed in Firefox 139 and Thunderbird 139.

PUBLISHED Reserved 2025-05-27 | Published 2025-05-27 | Updated 2026-04-13 | Assigner mozilla

Product status

139 (rpm)
unaffected

139 (rpm)
unaffected

Credits

the Mozilla Fuzzing Team, Andrew Osmond

References

bugzilla.mozilla.org/...i?bug_id=1726254%2C1742738%2C1960121 (Memory safety bugs fixed in Firefox 139 and Thunderbird 139)

www.mozilla.org/security/advisories/mfsa2025-42/

www.mozilla.org/security/advisories/mfsa2025-45/

cve.org (CVE-2025-5272)

nvd.nist.gov (CVE-2025-5272)

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