CVEvulnerability
CVE-2026-14899
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-22
- Last modified
- 2026-10-24
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Weaknesses
- CWE-193
Description
The code to parse MIME headers for display when forwarding a message (if the setting to view all headers was enabled) had an off-by-one error, allowing a single byte to be read from the memory after the buffer for the headers, and potentially crashing Thunderbird. This vulnerability was fixed in Thunderbird 153 and Thunderbird 140.13.
Affected configurations
• mozilla thunderbird (< 140.13.0)
Related
Weakness · CWE (1)
- CWE-193 Off-by-one Error weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2046137 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-71/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-72/ Vendor Advisory