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.
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Wed, 15 Jul 2026 15:30:00 +0000
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Wed, 15 Jul 2026 12:15:00 +0000
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threat_severity
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Tue, 14 Jul 2026 21:15:00 +0000
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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 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. | |
| Title | Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve | |
| Weaknesses | CWE-400 CWE-770 |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-07-14T20:53:12.497Z
Updated: 2026-07-15T14:27:06.146Z
Reserved: 2026-05-30T04:17:43.095Z
Link: CVE-2026-49476
Updated: 2026-07-15T14:26:41.737Z
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