Security vulnerabilities and automated fixes for soupsieve issues
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A high-severity memory exhaustion vulnerability (CVE-2026-49476) was discovered in Soup Sieve version 2.8.3, affecting Python applications that parse CSS selectors from user-controlled input. The vulnerability allows attackers to craft malicious selector lists that consume excessive memory, potentially causing denial of service. The fix involves upgrading to soupsieve 2.8.4, which implements proper resource limits on selector parsing.
A high-severity memory exhaustion vulnerability (CVE-2026-49476) was discovered in soupsieve 2.8.3, a CSS selector library used by BeautifulSoup in Python. An attacker who could influence CSS selector input could craft large comma-separated selector lists to exhaust system memory, causing denial of service. The fix upgrades soupsieve from 2.8.3 to 2.8.4 in the backend's `uv.lock` dependency file.