MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated "=?" sequences in decodemimewords.
CVE-2026-116270
MIME::Words versions before 5.521 for Perl allow memory exhaustion via repeated "=?" sequences in decodemimewords. For each "=?" that does not start a complete encoded word, decodemimewords 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.
Assessment
- CVSS
- Not yet scored
- Severity
- Unscored
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 28 October 2026
- Last updated
- 29 October 2026
- Weakness
- CWE-407
- Assigner
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
At the source
References
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