MIME::Parser vulnerabilities

MIME::Parser versions before 5.521 for Perl set no limit on the number of message parts by default, allowing memory exhaustion. The max_parts option defaulted to -1 (no limit); version 5.521 sets max_parts to 1000 and max_depth to 64 by default.

MIME::Parser versions before 5.521 for Perl allow memory exhaustion via indented error messages from a truncated, deeply nested message. Each stored parser diagnostic is indented by three spaces per nesting level, and when a message nested N levels deep ends without its closing boundaries, every level logs an error at its own depth, so the stored diagnostics grow with the square of N. The defaults place no limit on nesting depth.

Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU resources.