{"id":"DEBIAN-CVE-2026-49477","details":"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 contains a regular expression vulnerable to catastrophic backtracking when processing an attribute selector with an unterminated quoted value in soupsieve/css_parser.py, allowing an attacker who can supply untrusted CSS selector strings to soupsieve.compile() or Beautiful Soup .select() / .select_one() to cause CPU exhaustion and denial of service. This issue is fixed in version 2.8.4.","modified":"2026-09-01T16:06:48.246211096Z","published":"2026-07-14T21:17:02.007Z","upstream":["CVE-2026-49477"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-49477"}],"affected":[{"package":{"name":"soupsieve","ecosystem":"Debian:12","purl":"pkg:deb/debian/soupsieve?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.2-1","2.4-1","2.4.1-1","2.4.1-2","2.5-1","2.6-1","2.7-1","2.7-2","2.8.1-1","2.8.3-1","2.8.4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49477.json"}},{"package":{"name":"soupsieve","ecosystem":"Debian:13","purl":"pkg:deb/debian/soupsieve?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.7-1","2.7-2","2.8.1-1","2.8.3-1","2.8.4-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49477.json"}},{"package":{"name":"soupsieve","ecosystem":"Debian:14","purl":"pkg:deb/debian/soupsieve?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.4-1"}]}],"versions":["2.7-1","2.7-2","2.8.1-1","2.8.3-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-49477.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}