CVE-2021-32052 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in django. A fix is available for django — see the affected versions and patch details below.
Header injection possible in Django
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2021-32052 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
django🐍django🐍djangoReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
In Django 2.2 before 2.2.22, 3.1 before 3.1.10, and 3.2 before 3.2.2 (with Python 3.9.5+), URLValidator does not prohibit newlines and tabs (unless the URLField form field is used). If an application uses values with newlines in an HTTP response, header injection can occur. Django itself is unaffected because HttpResponse prohibits newlines in HTTP headers.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | django | ≥ 2.2&&< 2.2.22 | 2.2.22pip install --upgrade 'django==2.2.22' |
| 🐍PyPI | django | ≥ 3.1&&< 3.1.10 | 3.1.10pip install --upgrade 'django==3.1.10' |
| 🐍PyPI | django | ≥ 3.2&&< 3.2.2 | 3.2.2pip install --upgrade 'django==3.2.2' |
Affected Products
djangodjangoprojectfedorafedoraprojectDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update django to 2.2.22 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-32052 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
* Red Hat Gluster Storage 3 ships an old version of Django (v1.11.27) that provides support for Python 3.7, hence not affected by this vulnerability. * Red Hat Satellite and Red Hat Update Infrastructure ships affected versions of Django, however, products make use of Python 2.7 and Python 3.6 consumed from RHEL…
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.Source: Red Hat security advisory for CVE-2021-32052 (CC BY 4.0)
Frequently Asked Questions
Is CVE-2021-32052 in your dependencies?
Find it across PyPI, including transitive dependencies.