The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character.

Summary

The email module of Python through 3.11.3 incorrectly parses e-mail addresses that contain a special character. The wrong portion of an RFC2822 header is identified as the value of the addr-spec. In some applications, an attacker can bypass a protection mechanism in which application access is granted only after verifying receipt of e-mail to a specific domain (e.g., only @company.example.com addresses may be used for signup). This occurs in email/_parseaddr.py in recent versions of Python.

Timeline

1. Apr 18, 2023, 12:00 AM UTCCVE published
2. Dec 17, 2025, 9:27 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: yes · Technical impact: partial

3. May 12, 2026, 10:52 AM UTCRecord last updated

Affected versions

• n/a n/a

  Version range not reported

References 23