---
title: CVE-2026-15337
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-15337
---

# CVE-2026-15337

Publication date 4 August 2026

Last updated 7 August 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**5.3 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-15337#impact-score)

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## Description

An issue was discovered in Django 5.2 before 5.2.17 and 6.0 before 6.0.8.
`django.utils.translation.check\_for\_language()` is subject to a potential
denial-of-service attack when given many distinct, very long language
codes, which are retained as keys in an in-memory cache and consume process
memory. Such codes reach the function through the
`django.views.i18n.set\_language()` view, which is not routed by default.
The consumed memory is bounded, since request data is limited by the
`DATA\_UPLOAD\_MAX\_MEMORY\_SIZE` setting (default 2.5 MB) and the cache holds
a fixed maximum number of entries.
Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were
not evaluated and may also be affected.
Django would like to thank Jaeyoung Jang for reporting this issue.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| python-django | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |
| 14.04 LTS trusty | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-15337)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-15337)

**Base score**

6.9 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | None |
  | Vulnerable system - Integrity impact | None |
  | Vulnerable system - Availability impact | Low |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 6.9 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-15337)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-15337)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-15337)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-15337)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-15337>
* <https://www.djangoproject.com/weblog/2026/aug/04/security-releases/>
* <https://docs.djangoproject.com/en/dev/releases/security/>
* <https://github.com/django/django/commit/224dbc832586ad5cfb0237c2ff30d14baeaddc6f>
* <https://github.com/django/django/commit/27137e655e442e81095f1f8f77ff3870d9fdf169>
* <https://github.com/django/django/commit/5b3523d29be25948e1dd90b3863a002f00fc865f>
* <https://github.com/django/django/commit/c72a5dbb64d0777f3f471f1be94e8b2ca91e0959>
* <https://groups.google.com/g/django-announce>