CVE-2024-27351: Regular expression denial-of-service in Django

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-03-15 · updated 2026-06-17
Weakness: CWE-1333

Description

In Django 3.2 before 3.2.25, 4.2 before 4.2.11, and 5.0 before 5.0.3, the django.utils.text.Truncator.words() method (with html=True) and the truncatewords_html template filter are subject to a potential regular expression denial-of-service attack via a crafted string. NOTE: this issue exists because of an incomplete fix for CVE-2019-14232 and CVE-2023-43665.

Affected products

Django: from 3.2 before 3.2.25; from 4.2 before 4.2.11; from 5.0 before 5.0.3 — fixed in 3.2.25, 4.2.11, 5.0.3
Pypi Django: from 3.2 before 3.2.25; from 4.2 before 4.2.11; from 5.0 before 5.0.3; 3.2, 3.2.1, 3.2.10, 3.2.11, 3.2.12, 3.2.13 (+33) — fixed in 3.2.25, 4.2.11, 5.0.3

How to fix

Upgrade to a fixed version: Django 3.2.25, 4.2.11, 5.0.3; Pypi Django 3.2.25, 4.2.11, 5.0.3. Check the vendor advisory for mitigations.

References

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