Buffer Over-read Affecting thunderbird package, versions [,140.13)[141.0,153.0)
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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Test your applications- Snyk IDSNYK-UNMANAGED-THUNDERBIRD-18305750
- published25 Jul 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
CVE-2026-14899 (opens in a new tab)How to fix?
Upgrade thunderbird to version 140.13, 153.0 or higher.
Overview
Affected versions of this package are vulnerable to Buffer Over-read in the MIME header parser when forwarding messages with the setting to view all headers enabled. An attacker can cause a crash or potentially access sensitive memory by sending a specially crafted email that triggers an off-by-one read beyond the allocated buffer. This is only exploitable if the configuration to display all message headers is enabled.