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CVE-2025-15282

Good to know:

Date: January 20, 2026

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

Severity Score

7.7

Related Resources (11)

Url: https://github.com/python/cpython/commit/a35ca3be5842505dab74dc0b90b89cde0405017a

Url: https://github.com/python/cpython/commit/05356b1cc153108aaf27f3b72ce438af4aa218c0

Url: https://github.com/python/cpython/pull/143926

Url: https://github.com/python/cpython/commit/f25509e78e8be6ea73c811ac2b8c928c28841b9f

Url: https://nvd.nist.gov/vuln/detail/CVE-2025-15282

Url: https://mail.python.org/archives/list/security-announce@python.org/thread/X66HL7SISGJT33J53OHXMZT4DFLMHVKF/

Url: https://github.com/python/cpython/commit/34d76b00dabde81a793bd06dd8ecb057838c4b38

Url: https://github.com/python/cpython/commit/4ed11d3cd288e6b90196a15c5a825a45d318fe47

Url: https://github.com/python/cpython/issues/143925

Url: https://github.com/python/cpython/commit/3f396ca9d7bbe2a50ea6b8c9b27c0082884d9f80

Url: https://www.mend.io/vulnerability-database/CVE-2025-15282

Severity Score

7.7

Weakness Type (CWE)

Improper Neutralization of CRLF Sequences ('CRLF Injection')

CWE-93

CVSS v3.1

Base Score:	7.7
Attack Vector (AV):	NETWORK
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	CHANGED
Confidentiality (C):	NONE
Integrity (I):	HIGH
Availability (A):	NONE

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