CVE-2026-84142
Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defec
CVSS
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Exploit Today
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Published: Sep 1, 2026 · Last modified: Sep 1, 2026
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Internally found bugs present in Thunderbird 154. 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 and Thunderbird 155.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=2029421%2C2040889%2C2045313%2C2045435%2C2053578%2C2058621%2C2058626
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/buglist.cgi?bug_id=2048796%2C2053150%2C2057356
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-82/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-86/
No related CVEs by CWE or product.