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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-49476

Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

facelessuser soupsieve

  • < 2.8.4affected

References