Django Denial-of-service in django.utils.text.Truncator
An issue was discovered in Django 1.11.x before 1.11.23, 2.1.x before 2.1.11, and 2.2.x before 2.2.4. 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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | django | >= 1.11a1, < 1.11.23, >= 2.1a1, < 2.1.11, >= 2.2a1, < 2.2.4 | 1.11.23, 2.1.11, 2.2.4 |
References
- https://www.djangoproject.com/weblog/2019/aug/01/security-releases/
- https://docs.djangoproject.com/en/dev/releases/security/
- https://groups.google.com/forum/#!topic/django-announce/jIoju2-KLDs
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00006.html
- https://seclists.org/bugtraq/2019/Aug/15
- https://www.debian.org/security/2019/dsa-4498
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00025.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STVX7X7IDWAH5SKE6MBMY3TEI6ZODBTK/
- https://security.netapp.com/advisory/ntap-20190828-0002/
- https://security.gentoo.org/glsa/202004-17
- https://github.com/advisories/GHSA-c4qh-4vgv-qc6g
- https://nvd.nist.gov/vuln/detail/CVE-2019-14232
- https://www.openwall.com/lists/oss-security/2023/10/04/6
- https://www.djangoproject.com/weblog/2019/aug/01/security-releases
- https://security.netapp.com/advisory/ntap-20190828-0002
- https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/5XTP44JEOSNXRVW4JDZXA5XGMBDZLWSW
- https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/3LGJSPCN3VEG2UJPYCUB6TU75JTIV2TQ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/STVX7X7IDWAH5SKE6MBMY3TEI6ZODBTK
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/STVX7X7IDWAH5SKE6MBMY3TEI6ZODBTK
- https://groups.google.com/forum/#%21topic/django-announce/jIoju2-KLDs
- https://github.com/pypa/advisory-db/tree/main/vulns/django/PYSEC-2019-11.yaml
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2019-11.yaml
- https://github.com/django/django
- https://docs.djangoproject.com/en/dev/releases/security
- http://www.openwall.com/lists/oss-security/2023/10/04/6
- http://www.openwall.com/lists/oss-security/2024/03/04/1
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- Python (PyPI)
- Package
django- Disclosed
- 02.08.2019
- Updated
- 11.10.2026 11:20
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2019-11 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-c4qh-4vgv-qc6g - CC BY 4.0
Vulnerability history: django
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 162
- First → latest
- 10.2007 08.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 16
- High 65
- Medium 63
- Low 18
Disclosures per year
- 2017: 3
- 2018: 5
- 2019: 11
- 2020: 6
- 2021: 8
- 2022: 14
- 2023: 7
- 2024: 14
- 2025: 12
- 2026: 26
earlier: 56
-
Django Denial-of-service in django.utils.text.Truncator this entry
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