sanic-cors contains an improper regular expression in the try_match() function
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | sanic-cors | <= 2.2.0 | no fix |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-37737
- 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
- https://pypi.org/project/sanic-cors
- https://github.com/advisories/GHSA-94jw-hqvj-vw74
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N- Weakness (CWE)
CWE-346- Platform
- Python (PyPI)
- Package
sanic-cors- Disclosed
- 05.06.2026
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-3539 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-94jw-hqvj-vw74 - CC BY 4.0
Vulnerability history: sanic-cors
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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