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.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-4rrr-2h4v-f3j9 Django has Inefficient Algorithmic Complexity
Ubuntu USN Ubuntu USN USN-8009-1 Django vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 03 Feb 2026 17:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 03 Feb 2026 15:00:00 +0000

Type Values Removed Values Added
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.
Title Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods
Weaknesses CWE-407
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: DSF

Published:

Updated: 2026-02-03T16:22:33.352Z

Reserved: 2026-01-21T12:49:21.258Z

Link: CVE-2026-1285

cve-icon Vulnrichment

Updated: 2026-02-03T16:22:24.499Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-02-03T15:16:13.570

Modified: 2026-02-03T17:15:59.530

Link: CVE-2026-1285

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses