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Echo: soupsieve: security update to 2.9.0

medium Tenable Self-Hosted Container Security Plugin ID 457647

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 2.9, the selector
 parser in src/soupsieve/css_parser.py defines IDENTIFIER with adjacent quantified groups over overlapping
 character classes, and VALUE embeds IDENTIFIER for attribute selectors. When an attacker-controlled
 selector contains a long identifier or unquoted attribute-value run followed by input that makes the
 overall match fail, the regular expression engine explores quadratically many splits between the
 overlapping groups. User-controlled selectors can reach this path through soupsieve.compile(),
 soupsieve.select(), or BeautifulSoup.select(), while applications using only hard-coded selectors are
 unaffected. The resulting CPU consumption can hold the Python GIL, exhaust application workers, and stall
 a service; successful plain identifier matches are linear, and the issue does not cause memory corruption
 or code execution. The issue is fixed in version 2.9. (CVE-2026-86000)

Solution

Update the soupsieve library and its related packages to version 2.9.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-86000

Plugin Details

Severity: Medium

ID: 457647

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: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-86000

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/19/2026

Vulnerability Publication Date: 9/17/2026

Reference Information

CVE: CVE-2026-86000