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Medium, CVSS 6.5amended

sanic-cors contains an improper regular expression in the try_match() function

CVE-2026-37737GHSA-94jw-hqvj-vw74

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI sanic-cors

    Affected
    <= 2.2.0
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
EPSS
  • CVE-2026-37737: 0.16% estimated exploitation activity in the next 30 days; percentile 5.69 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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 unauthorized access to cross-origin requests for authenticated resources.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-94jw-hqvj-vw74

  2. Revision 1 · created ·

    Published from osv record GHSA-94jw-hqvj-vw74

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-37737

Advisory: sanic-cors contains an improper regular expression in the try_match() function
IDs: CVE-2026-37737, GHSA-94jw-hqvj-vw74
Record: https://patchnext.com/advisories/cve-2026-37737 (revision 2, source checked 26 Oct 2026, 13:47 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI sanic-cors: affected <= 2.2.0

## Suggested inspection (read-only)
- `python -m pip show sanic-cors`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on sanic-cors.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-94jw-hqvj-vw74 (OSV record GHSA-94jw-hqvj-vw74 lists affected ranges: PyPI sanic-cors >=0 <=2.2.0)
- Verified: https://github.com/advisories/GHSA-94jw-hqvj-vw74 (GitHub-reviewed advisory GHSA-94jw-hqvj-vw74 lists affected ranges: PyPI sanic-cors >=0 <=2.2.0)

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