An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9.
Priority LOW 39CWE-22Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-22 and the CVSS impact.
Summary
An issue was discovered in Flask-CORS (aka CORS Middleware for Flask) before 3.0.9. It allows ../ directory traversal to access private resources because resource matching does not ensure that pathnames are in a canonical format.
Why it matters now
EPSS 0.03909 90th percentileScored 2026-11-07
Fix Partial Flask-Cors (PyPI): 3.0.9Red Hat: 1 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | Flask-Cors (PyPI) | before 3.0.9 | 3.0.9 | Patch available | GHSA-xc3p-ff3m-f46v |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- Flask-Cors (PyPI) Vendor— Affected before 3.0.9 Fixed in 3.0.9 Patch available GHSA-xc3p-ff3m-f46v
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:flask-cors_project:flask-cors:*:*:*:*:*:*:*:* | before 3.0.9 | Vulnerable | Flask-cors Project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:* | 15.0 sp1 | Vulnerable | openSUSE |
| cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:* | 15.0 sp2 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* | 15.2 | Vulnerable | openSUSE |
- cpe:2.3:a:flask-cors_project:flask-cors:*:*:*:*:*:*:*:* Versions before 3.0.9 Vulnerable ·Flask-cors Project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:a:opensuse:backports_sle:15.0:sp1:*:*:*:*:*:* Versions 15.0 sp1 Vulnerable ·openSUSE
- cpe:2.3:a:opensuse:backports_sle:15.0:sp2:*:*:*:*:*:* Versions 15.0 sp2 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* Versions 15.2 Vulnerable ·openSUSE
Remediation
- Fix · GHSA-xc3p-ff3m-f46v Flask-Cors (PyPI) Fixed in 3.0.9 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Quay 3 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-25032
- 2026-10-03 Alias added: GHSA-xc3p-ff3m-f46v
- 2026-11-05 Priority changed: MEDIUM → LOW
References
Advisory 8
Sources
- CVE-2020-25032 · CVE Program
- CVE-2020-25032 · NVD
- FIRST EPSS
- GHSA-xc3p-ff3m-f46v · GitHub Advisory Database · CC BY 4.0
- CVE-2020-25032 · Red Hat security data · CC BY 4.0
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