{"id":"CVE-2026-37737","details":"sanic-cors version 2.2.0 and prior contains an improper regular expression in the try_match() function in sanic_cors/core.py that uses re.match without end-anchoring. This allows an attacker to bypass CORS origin allowlists by registering a domain that begins with a trusted origin string, to gain unauthorized access to cross-origin requests for authenticated resources.","aliases":["GHSA-94jw-hqvj-vw74","PYSEC-2026-3539"],"modified":"2026-10-21T02:30:17.310536250Z","published":"2026-06-05T00:00:00Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37737.json","cna_assigner":"mitre"},"references":[{"type":"WEB","url":"https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/37xxx/CVE-2026-37737.json"},{"type":"ADVISORY","url":"https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-37737"},{"type":"PACKAGE","url":"https://github.com/ashleysommer/sanic-cors"},{"type":"PACKAGE","url":"https://pypi.org/project/Sanic-Cors/"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ashleysommer/sanic-cors","events":[{"introduced":"0"},{"last_affected":"e0a7ab17a6d6e4dae72aa0ce754c0d3527a100cb"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"0"},{"last_affected":"2.2.0"}],"source":"DESCRIPTION"}]}}],"versions":["2.2.0","2.2.0b1","2.1.0","2.0.1","2.0.0","1.0.1","1.0.0","0.10.0.post3","0.10.0.post2","0.10.0.post1","0.10.0","0.10.0.b1","0.9.9.post4","0.9.9.post3","0.9.9.post2","0.9.9.post1","0.9.9","0.9.8.post3","0.9.8.post2","0.9.8.post1","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.6.0.2","0.6.0.1","0.6.0.0","0.5.4.2","0.5.4.1","0.5.4.0","0.5.1.0","0.4.1.4","0.4.1.2","0.4.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-37737.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}