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CVE-2026-14899

7.5 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · mozillaNVD modified 2026-10-24 13:10

Affected (CPE criteria) 1

  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*

References 3