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HIGH severity

CVE-2026-1285 — django

HIGHFix: django/django@a33540b

CVE-2026-1285 is a high-severity (CVSS 7.5) CWE-407 vulnerability in django. A fix is available for django — see the affected versions and patch details below.

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

Also known asBIT-django-2026-1285GHSA-4rrr-2h4v-f3j9PYSEC-2026-45
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Nov 6, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-1285.

EPSS Exploitation Probability

via FIRST.org ↗
1.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs66th percentile — riskier than 66% of all scored CVEsHighest risk
0.00%0.54%1.07%1.61%0.1%1.1%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

3 pkgs affected
🐍django🐍django🐍django

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

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

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIdjango≥ 6.0a1&&< 6.0.26.0.2pip install --upgrade 'django==6.0.2'
🐍PyPIdjango≥ 5.2a1&&< 5.2.115.2.11pip install --upgrade 'django==5.2.11'
🐍PyPIdjango≥ 4.2a1&&< 4.2.284.2.28pip install --upgrade 'django==4.2.28'

Affected Products

1 product · 3 configurations
Application
djangodjangoproject
≥ 6.0 && < 6.0.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update django to 6.0.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-1285 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This is a MODERATE impact denial-of-service flaw in Django. Applications utilizing Django that process untrusted HTML inputs with a large number of unmatched end tags through the `Truncator.chars()` or `Truncator.words()` methods (with `html=True`), or the `truncatechars_html` and `truncatewords_html` template…

Workaround published by Red Hat
To mitigate this issue, applications utilizing Django should avoid processing untrusted HTML content through the `django.utils.text.Truncator.chars()` and `Truncator.words()` methods with `html=True`, or the `truncatechars_html` and `truncatewords_html` template filters. Restrict the use of these functions to only trusted inputs where the HTML structure is controlled and validated.
Source: Red Hat security advisory for CVE-2026-1285 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Ansible Automation Platform 2.5 for RHEL 8python3.12-django-0:4.2.28-1.el8apRHSA-2026:3959
Red Hat Ansible Automation Platform 2.6 for RHEL 9python3.12-django-0:4.2.28-1.el9apRHSA-2026:3958
Red Hat Satellite 6.16 for RHEL 8python-django-0:4.2.28-0.1.el8pcRHSA-2026:5971
Red Hat Satellite 6.17 for RHEL 9foreman-0:3.14.0.14-1.el9satRHSA-2026:5970
Red Hat Satellite 6.18 for RHEL 9python3.12-django-0:4.2.30-1.el9pcRHSA-2026:14835
Red Hat Discovery 2discovery/discovery-server-rhel9:1770913597RHSA-2026:2694
Red Hat Satellite 6.18satellite/iop-advisor-backend-rhel9:1773451075RHSA-2026:6291

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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CVE-2026-1285: django — Fixed in 6.0.2