{"id":"CVE-2026-49476","summary":"Soup Sieve: Memory Exhaustion via Large Comma-Separated Selector Lists in soupsieve","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 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.","aliases":["GHSA-2wc2-fm75-p42x","PYSEC-2026-3071"],"modified":"2026-07-17T18:29:35.810896575Z","published":"2026-07-14T20:53:12.497Z","related":["CGA-fqw6-g84h-prc6","SUSE-SU-2026:22660-1","openSUSE-SU-2026:21342-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49476.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-400","CWE-770"]},"references":[{"type":"WEB","url":"https://github.com/facelessuser/soupsieve/releases/tag/2.8.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49476.json"},{"type":"ADVISORY","url":"https://github.com/facelessuser/soupsieve/security/advisories/GHSA-2wc2-fm75-p42x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49476"},{"type":"FIX","url":"https://github.com/facelessuser/soupsieve/commit/28108ab805818c832d9568142a99844fd95a0d39"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/facelessuser/soupsieve","events":[{"introduced":"0"},{"fixed":"28108ab805818c832d9568142a99844fd95a0d39"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.8.4"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.8.3","2.8.2","2.8.1","2.8","2.7","2.6","2.5","2.4.1","2.4","2.3.2.post1","2.3.2","2.3.1","2.3","2.2.1","2.2","2.1.0","2.0.1","2.0.0","1.9.4","1.9.3","1.9.2","1.9.1","1.9.0","1.8.0","1.7.3","1.7.2","1.7.1","1.7.0","1.6.1","1.6.0","1.5.0","1.4.0","1.3.1","1.3.0","1.2.1","1.2.0","1.1.0","1.0.2","1.0.1","1.0.0","1.0.0b2","1.0.0b1","0.6.0","0.5.3","0.5.2","0.5.1","0.5.0","0.4.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-49476.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}