User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required Low

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.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Python
  • Cpython

No data.

No data.

References
Link Providers
https://github.com/python/cpython/commit/f25509e78e8be6ea73c811ac2b8c928c28841b9f cve-icon cve-icon
https://github.com/python/cpython/issues/143925 cve-icon cve-icon cve-icon
https://github.com/python/cpython/pull/143926 cve-icon cve-icon cve-icon
https://mail.python.org/archives/list/security-announce@python.org/thread/X66HL7SISGJT33J53OHXMZT4DFLMHVKF/ cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-15282 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-15282 cve-icon
History

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

Type Values Removed Values Added
References
Metrics threat_severity

None

 cvssV3_1

{'score': 4.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/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
Description User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
Title Header injection via newlines in data URL mediatype
Weaknesses CWE-93
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-01-21T16:14:47.449Z

Reserved: 2025-12-29T21:04:54.816Z

Link: CVE-2025-15282

cve-icon Vulnrichment

Updated: 2026-01-21T15:48:37.269Z

cve-icon NVD

Status : Received

Published: 2026-01-20T22:15:50.883

Modified: 2026-01-20T23:16:05.233

Link: CVE-2025-15282

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-01-20T21:35:13Z

Links: CVE-2025-15282 - Bugzilla