Vulnerability advisory

GHSA-4rrr-2h4v-f3j9

Django has Inefficient Algorithmic Complexity

Published Feb 3, 2026Updated Sep 10, 2026OSV record ↗

Also known as BIT-django-2026-1285CVE-2026-1285PYSEC-2026-45

Severity

CVSS 4.0CVSS: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

Affected versions

django PyPI

All django advisories →

Affected	Fixed in
`6.0a1` to before 6.0.2	`6.0.2`Advisories →
Also listed as affected (5) `6.0` `6.0.1` `6.0a1` `6.0b1` `6.0rc1`
`5.2a1` to before 5.2.11	`5.2.11`Advisories →
Also listed as affected (14) `5.2` `5.2.1` `5.2.10` `5.2.2` `5.2.3` `5.2.4` `5.2.5` `5.2.6` `5.2.7` `5.2.8` `5.2.9` `5.2a1` `5.2b1` `5.2rc1`
`4.2a1` to before 4.2.28	`4.2.28`Advisories →
Also listed as affected (31) `4.2` `4.2.1` `4.2.10` `4.2.11` `4.2.12` `4.2.13` `4.2.14` `4.2.15` `4.2.16` `4.2.17` `4.2.18` `4.2.19` `4.2.2` `4.2.20` `4.2.21` `4.2.22` `4.2.23` `4.2.24` `4.2.25` `4.2.26` `4.2.27` `4.2.3` `4.2.4` `4.2.5` `4.2.6` `4.2.7` `4.2.8` `4.2.9` `4.2a1` `4.2b1` `4.2rc1`

Description

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28.

django.utils.text.Truncator.chars() and Truncator.words() methods (with html=True) and the truncatechars_html and truncatewords_html template filters allow a remote attacker to cause a potential denial-of-service via crafted inputs containing a large number of unmatched HTML end tags. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.

Django would like to thank Seokchan Yoon for reporting this issue.

GHSA-4rrr-2h4v-f3j9

Affected versions

django PyPI

Description

References