CVE-2026-1285

Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods

State: Published
Severity: 7.5 High
Published: Feb 3, 2026
Updated: Feb 3, 2026
Reserved: Jan 21, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
Djangodjangoproject	6.0 to before 6.0.2Affected 6.0.2Not affected 5.2 to before 5.2.11Affected 5.2.11Not affected 4.2 to before 4.2.28Affected 4.2.28Not affected

References

Django security archivevendor-advisory
Django releases announcementsmailing-list
Django security releases issued: 6.0.2, 5.2.11, and 4.2.28vendor-advisory

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