CVE-2026-37737

State: Published
Severity: 6.5 Medium
Published: Jun 5, 2026
Updated: Jun 5, 2026
Reserved: Apr 6, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N	CISA-ADP

Weaknesses

CWE-625 Permissive Regular Expression
CWE-346 Origin Validation Error

Affected Products

Product	Versions
n/an/a	n/aAffected

References

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

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