CVE-2026-116270
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated "=?" sequences in decode_mimewords. For each "=?" that does not start a complete encoded word, decode_mimewords appends an error message containing the whole input string to $@, so 8,000 "=?" pairs add about 128 MB. From version 5.518, MIME::Parser decodes every multipart boundary this way, so a remote sender can exhaust the parsing process memory with one Content-Type header.
Risk Assessment
A remote attacker can send an email with a crafted Content-Type header, exhausting memory in the mail processing process and causing denial of service. This can block mail processing for the entire organization.
Recommendation
Update MIME::Words (and the related MIME::Parser) to version 5.521 or later. Consider limiting header size and nesting depth in the mail processing pipeline.
Related vulnerabilities
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Original NVD description (English source)
MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated "=?" sequences in decode_mimewords. For each "=?" that does not start a complete encoded word, decode_mimewords appends an error message containing the whole input string to $@. A boundary of 8,000 "=?" pairs (16,000 bytes) adds 8,000 copies of itself to $@, about 128 MB. From version 5.518, MIME::Parser decodes every multipart boundary this way, so a remote sender can exhaust the memory of the parsing process with one Content-Type header.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS