CRITICALVulnerability
CVE-2026-74987
Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. 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 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Properties
- severity
- CRITICAL
- score
- 9.8
- epss_score
- 0.00523
- cve_id
- CVE-2026-74987
- vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- published_at
- 2026-08-18T13:17:40.560
- last_modified
- 2026-09-01T22:17:12.020
- epss_percentile
- 0.42386
Related Entities (5)
ENRICHED_BY (1)
→[Source]FIRST EPSS
AFFECTS_PRODUCT (2)
→[Product]
→[Product]
DESCRIBED_BY (1)
→[Source]NVD
HAS_WEAKNESS (1)
→[Weakness]Improper Restriction of Operations within the Bounds of a Memory Buffer
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