PYSEC-2026-1383 Flask-CORS vulnerable to Improper Handling of Case Sensitivity

corydolphin/flask-cors version 5.0.1 contains a vulnerability where the request path matching is case-insensitive due to the use of the trymatch function, which is originally intended for matching hosts. This results in a mismatch because paths in URLs are case-sensitive, but the regex matching...

CVE-2026-37737

sanic-cors version 2.2.0 and prior contains an improper regular expression in the trymatch function in saniccors/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...

CVE-2026-37737

Sanic-Cors 2.2.0 and earlier versions contain an improper regular expression in the try_match() function of sanic_cors/core.py that uses re.match without end anchoring. This allows bypassing CORS origin allowlists by registering a domain that starts with a trusted origin string, leading to unauth...

Improper Handling of Case Sensitivity

Overview Flask-Cors is an A Flask extension adding a decorator for CORS support Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity in the trymatch function. An attacker can access restricted paths and potentially expose sensitive data by exploiting the case...