urllib3 up to 2.5.x allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as problematic has been found in urllib3 up to 2.5.x. Affected is an unknown function. Executing a manipulation can lead to allocation of resources. This vulnerability appears as CVE-2025-66418. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in urllib3 up to 2.5.x and classified as problematic. This vulnerability affects an unknown part. The manipulation with an unknown input leads to a allocation of resources vulnerability. The CWE definition for the vulnerability is CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. As an impact it is known to affect availability. CVE summarizes:

urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.

The advisory is available at github.com. This vulnerability was named CVE-2025-66418 since 11/29/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 277666 (Linux Distros Unpatched Vulnerability : CVE-2025-66418), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.6.0 eliminates this vulnerability. Applying the patch 24d7b67eac89f94e11003424bcf0d8f7b72222a8 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 (277666), EUVD (EUVD-2025-201421) and CERT Bund (WID-SEC-2025-2927). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • NetApp ActiveIQ Unified Manager

Productinfo

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: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
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: 277666
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-66418

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: urllib3 2.6.0
Patch: 24d7b67eac89f94e11003424bcf0d8f7b72222a8

Timelineinfo

11/29/2025 CVE reserved
12/05/2025 +6 days Advisory disclosed
12/05/2025 +0 days VulDB entry created
01/03/2026 +29 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-gm62-xv2j-4w53
Status: Confirmed

CVE: CVE-2025-66418 (🔒)
GCVE (CVE): GCVE-0-2025-66418
GCVE (VulDB): GCVE-100-334498
EUVD: 🔒
CERT Bund: WID-SEC-2025-2927 - NetApp ActiveIQ Unified Manager: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 12/05/2025 17:55
Updated: 01/03/2026 10:33
Changes: 12/05/2025 17:55 (67), 12/05/2025 20:45 (1), 12/09/2025 01:30 (2), 12/11/2025 03:51 (11), 01/03/2026 10:33 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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