{"id":"CVE-2026-37737","aliases":["PYSEC-2026-3539"],"url":"https://o3.security/vulnerability/CVE-2026-37737","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.","published":"2026-06-05T15:32:25Z","modified":"2026-07-23T15:11:37.862120010Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N"},"epss":{"score":0.00164,"percentile":0.05823,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"sanic-cors","fixedVersion":null}],"fix":null,"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"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-23T15:11:37.862120010Z"}}