CVE-2018-7537

MEDIUM5.3EPSS 3.2%

Django Denial-of-service possibility in truncatechars_html and truncatewords_html template filters

Published: 1/4/2019Modified: 4/28/2026

Description

An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. If django.utils.text.Truncator's chars() and words() methods were passed the html=True argument, they were extremely slow to evaluate certain inputs due to a catastrophic backtracking vulnerability in a regular expression. The chars() and words() methods are used to implement the truncatechars_html and truncatewords_html template filters, which were thus vulnerable.

Affected packages (5)

Alpine/py3-djangofrom 0, < 1.11.11-r0
Alpine/py-djangofrom 0, < 1.11.11-r0
Debian/python-djangofrom 0, < 1:1.11.11-1
PyPI/django>= 2.0, < 2.0.3
PyPI/django>= 1.8, < 1.8.19, >= 1.11, < 1.11.11, >= 2.0, < 2.0.3

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Description

Affected packages (5)

CVSS scores

References (18)