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Untriaged
Permalink CVE-2026-14899
created 3 days, 10 hours ago Activity log
  • Created suggestion 3 days, 10 hours ago
Off-by-one out of bounds read in MIME header parser for forwarding

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.

Affected products

Thunderbird
  • =<140.*
  • =<*

Matching in nixpkgs

pkgs.thunderbird-cli

Low-level CLI to manage Mozilla Thunderbird email from the shell

pkgs.thunderbird-mcp

MCP server for Thunderbird - enables AI assistants to access email, contacts, and calendars

pkgs.thunderbird-cli-bridge

HTTP/WebSocket bridge daemon between thunderbird-cli (or any HTTP client) and the Thunderbird-cli WebExtension. Stateless proxy, localhost-only.

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