CVE-2006-5877: The enigmail extension before 0.94.2 does not properly handle large, encrypted file e-mail attachments, whi...

Security readout for executives and security teams

This is a legacy denial-of-service issue in Enigmail before 0.94.2. A maliciously large encrypted file attachment could crash an affected mail client, demonstrated with Mozilla Thunderbird. The business impact is disruption to individual users, not evidence of data theft or system takeover. Exposure is likely limited to legacy Thunderbird environments using Enigmail versions before 0.94.2, especially systems that still process encrypted email attachments. The source bundle does not identify broader affected products beyond Enigmail and Thunderbird demonstration context. Treat as a low-priority legacy hygiene item unless affected encrypted email workflows are business-critical. Remediate during normal patching, with urgency increased for teams still relying on old Thunderbird and Enigmail installations. Mitigation focus: Upgrade Enigmail to version 0.94.2 or later where still deployed.; Apply relevant vendor security updates, including Ubuntu advisory guidance where applicable.; Retire unsupported Thunderbird/Enigmail installations from production workflows..

Prepared

Jun 29, 2026, 07:22 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.