CVE-2026-84144
Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or anoth
CVSS
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No CVSS
EPSS
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KEV
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Exploit Today
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0-100
Published: Sep 1, 2026 · Last modified: Sep 1, 2026
Not enough EPSS history yet.
Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=2054619%2C2054620%2C2054624%2C2054702%2C2054726%2C2054775%2C2055703%2C2058006%2C2058013%2C2058098%2C2058627%2C2058661%2C2059127%2C2059128%2C2059180%2C2059199%2C2059205%2C2061320%2C2061430%2C2061495%2C2061505%2C2061532%2C2061799
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=2054625%2C2059002%2C2061775
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=2054691%2C2058085%2C2059144%2C2059191%2C2059192%2C2061521%2C2062395%2C2062404
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-82/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-85/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-86/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-88/
No related CVEs by CWE or product.