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CVE-2026-49477— Soup Sieve: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser

CVSS 7.5 · High EPSS 0.60% · P45

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProductVersion RangeStatus
facelessusersoupsieve< 2.8.4affected
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I. Basic Information for CVE-2026-49477

Vulnerability Information
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Vulnerability Title
Soup Sieve: Regular Expression Denial of Service (ReDoS) in soupsieve Selector Parser
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
facelessuser soupsieve 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
facelessuser soupsieve是facelessuser个人开发者的一个CSS选择器筛选库。 facelessuser soupsieve 2.8.4之前版本存在资源管理错误漏洞，该漏洞源于soupsieve中的CSS选择器解析器在处理未闭合引号值的属性选择器时，正则表达式存在灾难性回溯问题，可能导致CPU耗尽和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
facelessusersoupsieve < 2.8.4 -

II. Public POCs for CVE-2026-49477

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 123993 chars
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III. Intelligence Information for CVE-2026-49477

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Patches & Fixes for CVE-2026-49477 (1)

Vendor Advisories for CVE-2026-49477 (1)

Vendor Pages for CVE-2026-49477 (1)

IV. Related Vulnerabilities

Same product: soupsieve
Same vendor: facelessuser
Same weakness: CWE-400

V. Comments for CVE-2026-49477

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