CVE catalog

CVE-2024-6839

Flask-CORS vulnerabilities

Severity: Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Published: Mar 20, 2025, 10:15:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.74% · Oct 25, 2026

corydolphin/flask-cors version 4.0.1 contains an improper regex path matching vulnerability. The plugin prioritizes longer regex patterns over more specific ones when matching paths, which can lead to less restrictive CORS policies being applied to sensitive endpoints. This mismatch in regex pattern priority allows unauthorized cross-origin access to sensitive data or functionality, potentially exposing confidential information and increasing the risk of unauthorized actions by malicious actors.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	python-flask-cors	sid	`6.0.5-1`	fixed
Debian	python-flask-cors	forky	`6.0.5-1`	fixed
Debian	python-flask-cors	trixie	`6.0.1-1`	fixed
Debian	python-flask-cors	bookworm	`3.0.10-2+deb12u1`	fixed
Ubuntu	python-flask-cors	noble	`4.0.0-1ubuntu0.1~esm1`	fixed
Ubuntu	python3-flask-cors	noble	`4.0.0-1ubuntu0.1~esm1`	fixed
PyPI	flask-cors	Not reported	`6.0.0`	fixed
Opensuse	python-Flask-Cors	tumbleweed	`6.0.2-1.1`	fixed
Ubuntu	python-flask-cors	pro	`4.0.0-1`	vulnerable
Ubuntu	python-flask-cors	pro	`4.0.0-1ubuntu0.1~esm1`	fixed
Ubuntu	python-flask-cors	22.04	`3.0.9-2`	vulnerable
Ubuntu	python-flask-cors	22.04	`3.0.9-2ubuntu0.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	python-flask-cors	source	sid	`6.0.1-1`	not yet assigned	Not reported	[1100988]
Debian	python-flask-cors	source	forky	`6.0.1-1`	not yet assigned	Not reported	[1100988]
Debian	python-flask-cors	source	trixie	`6.0.1-1`	not yet assigned	Not reported	[1100988]
Debian	python-flask-cors	source	bookworm	`3.0.10-2+deb12u1`	not yet assigned	Not reported	[1100988]
Ubuntu	python-flask-cors	deb	noble	`4.0.0-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
Ubuntu	python3-flask-cors	deb	noble	`4.0.0-1ubuntu0.1~esm1`	Not reported	Not reported	Not reported
PyPI	flask-cors	PyPI	Not reported	`6.0.0`	Not reported	GHSA-7RXF-GVFG-47G4	Not reported
Opensuse	python-Flask-Cors	rpm	tumbleweed	`6.0.2-1.1`	Not reported	OPENSUSE-SU-2026:10485-1	Not reported
Ubuntu	python-flask-cors	deb	pro	`4.0.0-1ubuntu0.1~esm1`	Not reported	UBUNTU-CVE-2024-6839	Not reported
Ubuntu	python-flask-cors	deb	22.04	`3.0.9-2ubuntu0.1`	Not reported	UBUNTU-CVE-2024-6839	Not reported

[Debian bug #1100988]

OpenFactory catalog packages

[openSUSE Tumbleweed]

[python313-Flask-Cors]Unknown
Source package: [python-Flask-Cors]
Details (1)
- 6.0.2-1.2 · noarch · tumbleweed
  Unknown · Fixed: 6.0.2-1.1
  Version impact unknown
  usn · python-Flask-Cors · opensuse · tumbleweed
[python314-Flask-Cors]Unknown
Source package: [python-Flask-Cors]
Details (1)
- 6.0.2-1.2 · noarch · tumbleweed
  Unknown · Fixed: 6.0.2-1.1
  Version impact unknown
  usn · python-Flask-Cors · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[python3-flask-cors]Fixed
Source package: [python-flask-cors]
Details (2)
- 3.0.10-2+deb12u1 · all · bookworm
  Fixed · Fixed: 3.0.10-2+deb12u1
  usn · python-flask-cors · debian · bookworm; usn · python-flask-cors · debian · 12
- 3.0.10-2+deb12u1 · all · bookworm
  Fixed · Fixed: 3.0.10-2+deb12u1
  usn · python-flask-cors · debian · bookworm; usn · python-flask-cors · debian · 12

[Debian 13 (Trixie)]

[python3-flask-cors]Fixed
Source package: [python-flask-cors]
Details (2)
- 6.0.1-1 · all · trixie
  Fixed · Fixed: 6.0.1-1
  usn · python-flask-cors · debian · 13
- 6.0.1-1 · all · trixie
  Fixed · Fixed: 6.0.1-1
  usn · python-flask-cors · debian · 13

Observed: Oct 24, 2026, 11:27:14 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]