CVE-2026-1285
Description
A flaw was found in Django. A remote attacker can exploit this vulnerability by providing crafted inputs containing a large number of unmatched HTML end tags to the django.utils.text.Truncator.chars() and Truncator.words() methods (when html=True), or through the truncatechars_html and truncatewords_html template filters. This can lead to a denial-of-service (DoS) condition, making the application unavailable to legitimate users.
Statement
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 filters, may experience resource exhaustion. This can lead to the application becoming unavailable.
Mitigation
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.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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