CVE-2025-15282
Header injection via newlines in data URL mediatype
Description
User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype.
INFO
Published Date :
Jan. 20, 2026, 10:15 p.m.
Last Modified :
Jan. 26, 2026, 3:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 28c92f92-d60d-412d-b760-e73465c3df22 | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Avoid parsing data URLs with urllib.request.DataHandler.
- Validate mediatype in data URLs.
- Do not allow newlines in mediatype.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-15282.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-15282 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-15282
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-15282 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-15282 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jan. 26, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/34d76b00dabde81a793bd06dd8ecb057838c4b38 Added Reference https://github.com/python/cpython/commit/3f396ca9d7bbe2a50ea6b8c9b27c0082884d9f80 Added Reference https://github.com/python/cpython/commit/4ed11d3cd288e6b90196a15c5a825a45d318fe47 Added Reference https://github.com/python/cpython/commit/a35ca3be5842505dab74dc0b90b89cde0405017a -
CVE Modified by [email protected]
Jan. 23, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/05356b1cc153108aaf27f3b72ce438af4aa218c0 -
CVE Modified by [email protected]
Jan. 20, 2026
Action Type Old Value New Value Added Reference https://github.com/python/cpython/commit/f25509e78e8be6ea73c811ac2b8c928c28841b9f -
New CVE Received by [email protected]
Jan. 20, 2026
Action Type Old Value New Value Added Description User-controlled data URLs parsed by urllib.request.DataHandler allow injecting headers through newlines in the data URL mediatype. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-93 Added Reference https://github.com/python/cpython/issues/143925 Added Reference https://github.com/python/cpython/pull/143926 Added Reference https://mail.python.org/archives/list/[email protected]/thread/X66HL7SISGJT33J53OHXMZT4DFLMHVKF/