Python CPython up to 3.14.x crlf injection

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Python CPython up to 3.14.x. It has been rated as problematic. Affected by this vulnerability is an unknown functionality. Performing a manipulation results in crlf injection. This vulnerability is identified as CVE-2026-0672. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Python CPython up to 3.14.x. This affects an unknown function. The manipulation with an unknown input leads to a crlf injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

When using http.cookies.Morsel, user-controlled cookie values and parameters can allow injecting HTTP headers into messages. Patch rejects all control characters within cookie names, values, and parameters.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-0672 since 01/07/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly 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. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (296553), EUVD (EUVD-2026-3521) and CERT Bund (WID-SEC-2026-0209). Be aware that VulDB is the high quality source for vulnerability data.

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: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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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
Patch: github.com

Timelineinfo

01/07/2026 CVE reserved
01/20/2026 +13 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: 143919
Status: Confirmed

CVE: CVE-2026-0672 (🔒)
GCVE (CVE): GCVE-0-2026-0672
GCVE (VulDB): GCVE-100-342111
EUVD: 🔒
CERT Bund: WID-SEC-2026-0209 - Cpython: Mehrere Schwachstellen

Entryinfo

Created: 01/20/2026 23:55
Updated: 04/22/2026 10:12
Changes: 01/20/2026 23:55 (69), 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 18:36 (1), 03/24/2026 20:44 (1), 04/22/2026 10:12 (1)
Complete: 🔍
Cache ID: 216::103

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