Integer Overflow or Wraparound Affecting thunderbird package, versions [,158)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UNMANAGED-THUNDERBIRD-20883352
- published13 Oct 2026
- disclosed13 Oct 2026
- creditUnknown
Introduced: 13 Oct 2026
NewCVE-2026-110247 (opens in a new tab)How to fix?
Upgrade thunderbird to version 158 or higher.
Overview
Affected versions of this package are vulnerable to Integer Overflow or Wraparound due to improper size arithmetic in buffer growth operations within libmime. An attacker can cause heap corruption by sending a specially crafted large message that triggers a buffer to be reallocated smaller than required, allowing attacker-controlled data to overwrite adjacent heap allocations.