Python CPython up to 3.14.x urllib.request.DataHandler crlf injection

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Python CPython up to 3.14.x. It has been declared as problematic. The affected element is an unknown function in the library urllib.request.DataHandler. Executing a manipulation can lead to crlf injection. This vulnerability is registered as CVE-2025-15282. It is possible to launch the attack remotely. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Python CPython up to 3.14.x and classified as critical. This vulnerability affects some unknown processing in the library urllib.request.DataHandler. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-15282 since 12/29/2025. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 296553 (Debian dla-4455 : idle-python3.9 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 3.15.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (296553), EUVD (EUVD-2025-206305) and CERT Bund (WID-SEC-2026-0209). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Fedora Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Python
  • Dell Secure Connect Gateway

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 296553
Nessus Name: Debian dla-4455 : idle-python3.9 - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CPython 3.15.0

Timelineinfo

12/29/2025 CVE reserved
01/20/2026 +22 days Advisory disclosed
01/20/2026 +0 days VulDB entry created
04/22/2026 +92 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2025-15282 (🔒)
GCVE (CVE): GCVE-0-2025-15282
GCVE (VulDB): GCVE-100-342040
EUVD: 🔒
CERT Bund: WID-SEC-2026-0209 - Cpython: Mehrere Schwachstellen

Entryinfo

Created: 01/20/2026 23:27
Updated: 04/22/2026 10:12
Changes: 01/20/2026 23:27 (68), 01/21/2026 00:22 (1), 01/26/2026 07:44 (2), 02/02/2026 10:02 (7), 03/11/2026 06:08 (1), 03/11/2026 14:26 (1), 03/24/2026 20:44 (1), 04/22/2026 10:12 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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