{"id":"PYSEC-2026-3539","summary":"sanic-cors contains an improper regular expression in the try_match() function","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":["CVE-2026-37737","GHSA-94jw-hqvj-vw74"],"modified":"2026-07-23T15:00:23.754390138Z","published":"2026-07-23T11:41:39.408627Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-37737"},{"type":"PACKAGE","url":"https://github.com/ashleysommer/sanic-cors"},{"type":"WEB","url":"https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py"},{"type":"WEB","url":"https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md"},{"type":"WEB","url":"https://pypi.org/project/Sanic-Cors"},{"type":"PACKAGE","url":"https://pypi.org/project/sanic-cors"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-94jw-hqvj-vw74"}],"affected":[{"package":{"name":"sanic-cors","ecosystem":"PyPI","purl":"pkg:pypi/sanic-cors"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.2.0"}]}],"versions":["0.10.0","0.10.0.post1","0.10.0.post2","0.10.0.post3","0.10.0b1","0.4.1","0.4.1.2","0.4.1.4","0.5.1.0","0.5.4.1","0.5.4.2","0.6.0.0","0.6.0.1","0.6.0.2","0.9.0","0.9.1","0.9.2","0.9.3","0.9.4","0.9.5","0.9.6","0.9.7","0.9.8","0.9.8.post1","0.9.8.post2","0.9.8.post3","0.9.9","0.9.9.post1","0.9.9.post2","0.9.9.post3","0.9.9.post4","1.0.0","1.0.1","2.0.0","2.0.1","2.1.0","2.2.0","2.2.0b1"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/sanic-cors/PYSEC-2026-3539.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"}]}