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Vulnerabilities CVE-2026-49477

CVE-2026-49477

High
Open
TLP:CLEAR

Soup Sieve: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser

AI Analysis

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Description

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.

Details

CVSS Score
7.5
EPSS Score
0.52%

41.6th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Jul 14, 2026
Last Modified
Jul 14, 2026
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