When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00039.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Python Subscribe
Cpython Subscribe

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Python Subscribe
Cpython Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/python/cpython/commit/17d1490aa97bd6b98a42b1a9b324ead84e7fd8a2 cve-icon cve-icon
https://github.com/python/cpython/issues/143935 cve-icon cve-icon cve-icon
https://github.com/python/cpython/pull/143936 cve-icon cve-icon cve-icon
https://mail.python.org/archives/list/security-announce@python.org/thread/FELSEOLBI2QR6YLG6Q7VYF7FWSGQTKLI/ cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-11468 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-11468 cve-icon
History

Thu, 22 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-140
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:N'}

threat_severity

Moderate

Wed, 21 Jan 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 21 Jan 2026 11:30:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Tue, 20 Jan 2026 22:45:00 +0000

Type Values Removed Values Added
References

Tue, 20 Jan 2026 21:45:00 +0000

Type Values Removed Values Added
References

Tue, 20 Jan 2026 21:30:00 +0000

Type Values Removed Values Added
Description When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not sanitized.
Title Folding email comments of unfoldable characters doesn't preserve parenthesis
References
Metrics cvssV4_0

{'score': 5.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-01-21T16:14:56.710Z

Reserved: 2025-10-07T21:04:42.377Z

Link: CVE-2025-11468

cve-icon Vulnrichment

Updated: 2026-01-21T15:48:39.281Z

cve-icon NVD

Status : Received

Published: 2026-01-20T22:15:50.690

Modified: 2026-01-20T23:16:05.123

Link: CVE-2025-11468

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-20T21:09:11Z

Links: CVE-2025-11468 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-21T11:18:54Z

Weaknesses