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Soupsieve <= 2.8.3

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medium advisory

Soup Sieve Memory Exhaustion via Large Comma-Separated Selector Lists (CVE-2026-49476)

A memory exhaustion vulnerability (CVE-2026-49476) in the soupsieve CSS selector parser, an indirect dependency of Beautiful Soup 4, allows an unauthenticated attacker to cause a denial of service by supplying a crafted, large comma-separated CSS selector string to applications using `soupsieve.compile()` or Beautiful Soup's `.select()`/`.select_one()`, leading to unbounded memory allocation and system resource exhaustion.

soupsieve <= 2.8.3 +1 denial-of-service memory-exhaustion python supply-chain
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