Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Thunderbird | affected |
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Advisories
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Fixes
Solution
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Workaround
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References
History
Tue, 01 Sep 2026 22:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2. | |
| Title | Uninitialized memory in MIME parsing | |
| References |
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Projects
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MITRE
Status: PUBLISHED
Assigner: mozilla
Published:
Updated: 2026-09-01T21:44:15.369Z
Reserved: 2026-09-01T21:33:05.937Z
Link: CVE-2026-84639
Vulnrichment
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NVD
Status : Received
Published: 2026-09-01T22:17:19.700
Modified: 2026-09-01T22:17:19.700
Link: CVE-2026-84639
Redhat
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OpenCVE Enrichment
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Weaknesses
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