REDHAT-BUG-2419455: High severity pypi/urllib3 vulnerability

Published Dec 5, 2025
·
Updated

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.

Affected Software

1 affected component
pypi/urllib3>=1.24<2.6.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade urllib3 to a version that resolves this vulnerability.

    Fixed in 2.6.0

Event History

Dec 5, 2025
Data Sourced
via Red Hat·05:01 PM
DescriptionSeverityAffected Software

Frequently Asked Questions

1

What is the severity of REDHAT-BUG-2419455?

REDHAT-BUG-2419455 has a high severity level due to its potential for causing excessive CPU and memory usage.

2

How do I fix REDHAT-BUG-2419455?

To fix REDHAT-BUG-2419455, update urllib3 to a version greater than 2.6.0.

3

What versions of urllib3 are affected by REDHAT-BUG-2419455?

REDHAT-BUG-2419455 affects urllib3 versions from 1.24 up to but not including 2.6.0.

4

What type of vulnerability is REDHAT-BUG-2419455?

REDHAT-BUG-2419455 is a vulnerability related to unlimited decompression chains that can lead to resource exhaustion.

5

Who reported REDHAT-BUG-2419455?

REDHAT-BUG-2419455 was reported by users within the Red Hat community concerning the urllib3 library.

Contact

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