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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-103500

Heap buffer overflow opening large email

Description

An attacker could cause a heap buffer overflow by getting a user to open an email that is greater than or equal to 2GB in size. This vulnerability was fixed in Thunderbird 157, Thunderbird 140.17, and Thunderbird 153.4.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mozilla Thunderbird

  • 140.17 to ≤ 140.*unaffected
  • 153.4 to ≤ 153.*unaffected
  • 157 to ≤ *unaffected

References