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CVE-2026-49477

HIGH
7.5
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-49477
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-30 04:17 UTC
Published
2026-07-14 20:51 UTC
Last updated
2026-07-14 20:51 UTC
Primary CWE
CWE-400
CWE-400: Uncontrolled Resource Consumption
Vendor / Product
facelessuser / soupsieve
Sources
cve.org  ·  NVD

Severity & Metrics

7.5 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products (1)
VendorProductPlatformVersions
facelessuser soupsieve — < 2.8.4
Weakness (CWE)
CWESourceDescription
CWE-1333 cna CWE-1333: Inefficient Regular Expression Complexity
CWE-400 cna CWE-400: Uncontrolled Resource Consumption
CVSS scores (1)
ScoreSeverityVersionSourceVector
7.5 HIGH 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References (3)
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