Vulnerability · Published Jun 3, 2026 · Assigned by DSF
CVE-2026-35193Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddleware
Low 3.1
In plain English
A low-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 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.middleware.cache.UpdateCacheMiddleware` in Django does not add `Authorization` to the `Vary` response header for requests bearing that header without `Cache-Control: public`, which allows remote attackers to read private cached responses via unauthenticated requests to the same URL. 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 Shai Berger for reporting this issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | py3-django | 5.2.15-r0 | ALPINE-CVE-2026-35193 |
| Debian:12 | python-django | no fix listed | DEBIAN-CVE-2026-35193 |
| Debian:13 | python-django | no fix listed | DEBIAN-CVE-2026-35193 |
| Debian:14 | python-django | 3:5.2.15-1 | DEBIAN-CVE-2026-35193 |
| PyPI | django | 5.2.15, 6.0.6 | PYSEC-2026-197 |
| PyPI | django | 6.0.6 | GHSA-qpc8-7fxc-cm4p |
| PyPI | django | 5.2.15 | GHSA-qpc8-7fxc-cm4p |
| Ubuntu:22.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-35193 |
| Ubuntu:24.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-35193 |
| Ubuntu:25.10 | python-django | no fix listed | UBUNTU-CVE-2026-35193 |
| Ubuntu:26.04:LTS | python-django | no fix listed | UBUNTU-CVE-2026-35193 |
| Ubuntu:26.10 | python-django | no fix listed | UBUNTU-CVE-2026-35193 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| djangoproject | Django | 6.0 – before 6.0.65.2 – before 5.2.15 |
Weakness: CWE-524 · Vector: CVSS:3.1/AV:N/AC:H/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: 6.0.6 and 5.2.15 vendor-advisory