Vulnerability · Published May 5, 2026 · Assigned by DSF
CVE-2026-6907Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware
Medium 4.3
In plain English
A medium-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 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. `django.middleware.cache.UpdateCacheMiddleware` erroneously caches requests where the `Vary` header contained an asterisk (`'*'`). This can lead to private data being stored and served. 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 Ahmad Sadeddin for reporting this issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | py3-django | 5.2.14-r0 | ALPINE-CVE-2026-6907 |
| Debian:12 | python-django | no fix listed | DEBIAN-CVE-2026-6907 |
| Debian:13 | python-django | no fix listed | DEBIAN-CVE-2026-6907 |
| Debian:14 | python-django | 3:5.2.14-1 | DEBIAN-CVE-2026-6907 |
| PyPI | django | 5.2.14, 6.0.5 | PYSEC-2026-55 |
| PyPI | django | 6.0.5 | GHSA-5hrc-gvxj-w55p |
| PyPI | django | 5.2.14 | GHSA-5hrc-gvxj-w55p |
| Ubuntu:22.04:LTS | python-django | 2:3.2.12-2ubuntu1.29 | USN-8848-1 |
| Ubuntu:22.04:LTS | python-django | 2:3.2.12-2ubuntu1.27 | UBUNTU-CVE-2026-6907 |
| Ubuntu:24.04:LTS | python-django | 3:4.2.11-1ubuntu1.16 | UBUNTU-CVE-2026-6907 |
| Ubuntu:24.04:LTS | python-django | 3:4.2.11-1ubuntu1.18 | USN-8848-1 |
| Ubuntu:25.10 | python-django | 3:5.2.4-1ubuntu2.5 | UBUNTU-CVE-2026-6907 |
| Ubuntu:26.04:LTS | python-django | 3:5.2.9-0ubuntu4.1 | UBUNTU-CVE-2026-6907 |
| Ubuntu:26.04:LTS | python-django | 3:5.2.9-0ubuntu4.3 | USN-8848-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.55.2 – before 5.2.14 |
Weakness: CWE-524 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
References
- Django security archive vendor-advisory
- Django releases announcements mailing-list
- Django security releases issued: 6.0.5 and 5.2.14 vendor-advisory