Detections
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Echo: python-urllib3: security update to 2.3.0-3+e1urllib3: security update to 2.6.0

high Tenable Cloud Security Plugin ID 460924

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.0 and prior to 2.6.0, the
 Streaming API improperly handles highly compressed data. urllib3's streaming API is designed for the
 efficient handling of large HTTP responses by reading the content in chunks, rather than loading the
 entire response body into memory at once. When streaming a compressed response, urllib3 can perform
 decoding or decompression based on the HTTP Content-Encoding header (e.g., gzip, deflate, br, or zstd).
 The library must read compressed data from the network and decompress it until the requested chunk size is
 met. Any resulting decompressed data that exceeds the requested amount is held in an internal buffer for
 the next read operation. The decompression logic could cause urllib3 to fully decode a small amount of
 highly compressed data in a single operation. This can result in excessive resource consumption (high CPU
 usage and massive memory allocation for the decompressed data. (CVE-2025-66471)

Solution

Update the python-urllib3 library and its related packages to version 2.3.0-3+e1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2025-66471

Plugin Details

Severity: High

ID: 460924

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 94.35

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-66471

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.9

Threat Score: 6.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 12/5/2025

Vulnerability Publication Date: 12/5/2025

Reference Information

CVE: CVE-2025-66471

IAVA: 2025-A-0900-S