CVE-2026-37737

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in, but needs a user to act. High risk of data exposure.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2026-06-05 15:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 10:41 UTC Last updatedMost recent change to the record

Details

Published

2026-06-05 15:16 UTC

Last modified

2026-06-17 10:41 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-346

Record status

Deferred

Attack profile CVSS 3.1 · 6.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None