Email Header Injection Vulnerability in Python's Email Module
CVE-2025-11468

5.7MEDIUM

Key Information:

Vendor

Python Software Foundation

Status
Cpython
Vendor
CVE Published:
20 January 2026

What is CVE-2025-11468?

The email module in Python allows for the injection of malicious headers due to improper handling of long comments in email headers. Specifically, when folding a long comment that contains only unfoldable characters, parentheses may not be preserved, leading to potential header injection attacks. This vulnerability occurs when user-controlled addresses are not adequately sanitized, enabling attackers to manipulate email messages.

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Affected Version(s)

CPython 0 < 3.15.0

References

https://github.com/python/cpython/pull/143936
patch
https://github.com/python/cpython/issues/143935
issue-tracking
https://mail.python.org/archives/list/security-announce@p...
vendor-advisory

CVSS V4

Score:
5.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Denis Ledoux
Seth Larson
Denis Ledoux
R. David Murray
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