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HIGH severity

Potential DoS with NumberFilter conversion to integer valuesGHSA-x7gm-rfgv-w973

HIGHFix: carltongibson/django-filter@340cf7a

GHSA-x7gm-rfgv-w973 is a high-severity (CVSS 7.5) CWE-681 vulnerability in django-filter. A fix is available for django-filter — see the affected versions and patch details below.

Also known asCVE-2020-15225PYSEC-2021-64
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs78th percentile — riskier than 78% of all scored CVEsHighest risk
0.00%0.77%1.53%2.30%0.2%1.8%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-x7gm-rfgv-w973 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐍django-filter

Real-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

Impact

Automatically generated NumberFilter instances, whose value was later converted to an integer, were subject to potential DoS from maliciously input using exponential format with sufficiently large exponents.

Patches

Version 2.4.0+ applies a MaxValueValidator with a a default limit_value of 1e50 to the form field used by NumberFilter instances.

In addition, NumberFilter implements the new get_max_validator() which should return a configured validator instance to customise the limit, or else None to disable the additional validation.

Workarounds

Users may manually apply an equivalent validator if they are not able to upgrade.

For more information

If you have any questions or comments about this advisory:

Thanks to Marcin Waraksa for the report.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIdjango-filterall versions2.4.0pip install --upgrade 'django-filter==2.4.0'

Affected Products

2 products · 3 configurations
Application
django-filterdjango-filter_project
< 2.4.0
range
OS
fedorafedoraproject
2 versions
3435

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django-filter, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update django-filter to 2.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-x7gm-rfgv-w973 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact Automatically generated `NumberFilter` instances, whose value was later converted to an integer, were subject to potential DoS from maliciously input using exponential format with sufficiently large exponents. ### Patches Version 2.4.0+ applies a `MaxValueValidator` with a a default `limit_value` of 1e50 to the form field used by `NumberFilter` instances. In addition, `NumberFilter` implements the new `get_max_validator()` which should return a configured validator instance to customise the limit, or else `None` to disable the additional validation. ### Workarounds Users ma
O3 Security · Impact-Aware SCA

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Potential DoS with NumberFilter conversion to integer…