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CVE-2026-49476— Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve

CVSS 7.5 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProductVersion RangeStatus
facelessusersoupsieve< 2.8.4affected
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I. Basic Information for CVE-2026-49476

Vulnerability Information
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Vulnerability Title
Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve
Source: CVE Program / CVE List V5
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 allocates unbounded memory when compiling large comma-separated selector lists, allowing an attacker who can supply a crafted selector string to soupsieve.compile() or Beautiful Soup .select() / .select_one() to allocate hundreds of megabytes of heap memory from a relatively small input and cause denial of service. This issue is fixed in version 2.8.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
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CSS选择器解析器在编译大型逗号分隔选择器列表时分配无界内存，导致攻击者通过提供特制选择器字符串分配数百兆堆内存并造成拒绝服务。
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-2026-49476

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 7795 chars
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III. Intelligence Information for CVE-2026-49476

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Patches & Fixes for CVE-2026-49476 (1)

Vendor Advisories for CVE-2026-49476 (1)

Vendor Pages for CVE-2026-49476 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49476

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