CVE-2026-37737

Weakness

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.

References

• https://github.com/ashleysommer/sanic-cors
• https://github.com/ashleysommer/sanic-cors/blob/master/sanic_cors/core.py
• https://github.com/npbhatter17/security-advisories/blob/main/CVE-2026-37737-sanic-cors-advisory.md
• https://pypi.org/project/Sanic-Cors/