Vulnerability Description
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.
Related Weaknesses (CWE)
References
FAQ
What is CVE-2026-116270?
CVE-2026-116270 is a documented vulnerability. 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...
How severe is CVE-2026-116270?
CVSS scoring is not yet available for CVE-2026-116270. Check NVD for updates.
Is there a patch for CVE-2026-116270?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.