CVE-2025-15282

Header injection via newlines in data URL mediatype

Published Jan 20, 2026 CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Description
User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4455-1 python3.9 security update
Ubuntu USN Ubuntu USN USN-8018-1 Python vulnerabilities
Ubuntu USN Ubuntu USN USN-8018-3 Python 2.7 vulnerabilities
History
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

Type Values Removed Values Added
Metrics ssvc

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

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

Weaknesses
  • CWE-93

    Improper Neutralization of CRLF Sequences ('CRLF Injection')

Sources

Status
PUBLISHED
Assigner
PSF
Published
Updated
Mar 3, 2026, 2:42 PM
Reserved
Dec 29, 2025, 9:04 PM
Status
Deferred
Published
Jan 20, 2026, 10:15 PM
Modified
Jun 17, 2026, 8:37 AM
Severity
Moderate
Public date
Jan 20, 2026, 9:35 PM