Not a U.S. government website. NDD is an independent vulnerability database by Volerion and is not affiliated with or endorsed by NIST or NVD.
CVE-2026-84641 Details
Description
A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID response. Heap contents can ultimately be persisted to prefs.js. This vulnerability was fixed in Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Sep 2, 2026Exploitation: NoneAutomatable: YesTechnical Impact: Partial
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=2057805 | [email protected] | Permissions Required |
| https://www.mozilla.org/security/advisories/mfsa2026-86/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-87/ | [email protected] | Vendor Advisory |
| https://www.mozilla.org/security/advisories/mfsa2026-88/ | [email protected] | Vendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| mozilla thunderbird | < 140.15.0 >= 141.0, < 153.2.0 >= 154.0, < 155.0 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | Initial Analysis | [email protected] |
| Sep 2, 2026 | CVE Modified | CISA-ADP |
| Sep 1, 2026 | New CVE Received | [email protected] |