Detections
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Echo: soupsieve: security update to 2.8.4

high Tenable Self-Hosted Container Security Plugin ID 457729

Description

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

 - Soup Sieve is a CSS selector library designed to be used with Beautiful Soup 4. Prior to 2.8.4, the CSS
 selector parser in soupsieve contains a regular expression vulnerable to catastrophic backtracking when
 processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an
 attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select()
 / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.
 (CVE-2026-49477)

Solution

Update the soupsieve library and its related packages to version 2.8.4 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-49477

Plugin Details

Severity: High

ID: 457729

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-49477

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/10/2026

Vulnerability Publication Date: 7/9/2026

Reference Information

CVE: CVE-2026-49477