Vulnerability · Published Feb 3, 2026 · Assigned by DSF
CVE-2026-1285Potential denial-of-service vulnerability in django.utils.text.Truncator HTML methods
High 7.5
In plain English
A high-severity security flaw in Django from djangoproject. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | py3-django | 4.2.28-r0 | ALPINE-CVE-2026-1285 |
| Alpine:v3.24 | py3-django | 4.2.28-r0 | ALPINE-CVE-2026-1285 |
| Debian:12 | python-django | 3:3.2.25-0+deb12u2 | DEBIAN-CVE-2026-1285 |
| Debian:12 | python-django | 3:3.2.25-0+deb12u2 | DSA-6150-1 |
| Debian:13 | python-django | 3:4.2.28-0+deb13u1 | DEBIAN-CVE-2026-1285 |
| Debian:13 | python-django | 3:4.2.28-0+deb13u1 | DSA-6150-1 |
| Debian:14 | python-django | 3:4.2.28-1 | DEBIAN-CVE-2026-1285 |
| PyPI | django | 5.2.11 | GHSA-4rrr-2h4v-f3j9 |
| PyPI | django | 6.0.2 | GHSA-4rrr-2h4v-f3j9 |
| PyPI | django | 4.2.28 | GHSA-4rrr-2h4v-f3j9 |
| PyPI | django | 4.2.28, 5.2.11, 6.0.2 | PYSEC-2026-45 |
| Ubuntu:22.04:LTS | python-django | 2:3.2.12-2ubuntu1.25 | UBUNTU-CVE-2026-1285 |
| Ubuntu:24.04:LTS | python-django | 3:4.2.11-1ubuntu1.14 | UBUNTU-CVE-2026-1285 |
| Ubuntu:25.10 | python-django | 3:5.2.4-1ubuntu2.3 | UBUNTU-CVE-2026-1285 |
| Ubuntu:26.04:LTS | python-django | 3:5.2.9-0ubuntu3 | UBUNTU-CVE-2026-1285 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.25.2 – before 5.2.114.2 – before 4.2.28 |
Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- Django security archive vendor-advisory
- Django releases announcements mailing-list
- Django security releases issued: 6.0.2, 5.2.11, and 4.2.28 vendor-advisory