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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.

🗓️ 01 Feb 2025 08:00:00Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 1 Views

Python's email module misparses addresses with special characters, misidentifying the addr-spec and enabling domain-based signup bypass.

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03 Jun 2026 08:39Current
7.5High risk
Vulners AI Score7.5
CVSS 3.15.3
EPSS0.00161
SSVC
1