CVE-2026-48587 Potential exposure of private data via whitespace padding in Vary header
Remote attackers can read cached private responses by exploiting whitespace padding in Vary headers, affecting Django web applications.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-48587?
CVE-2026-48587 is a low-severity vulnerability in Djangoproject Django, published on 3 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.utils.cache.has_vary_header()` in Django does not strip leading or trailing whitespace from `Vary` response header values before comparison, which allows remote attackers to read cached responses via requests to URLs whose responses contain whitespace-padded Vary header values. 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 Navid Rezazadeh for reporting this issue.
Weakness: CWE-1023
Which versions are affected by CVE-2026-48587?
6 open source packages ship an affected version, including django. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
django Bitnami | From 5.2.0 | 5.2.15, 6.0.6 |
django PyPI | All versions | 5.2.15 |
django PyPI | All versions | 5.2.15 |
django PyPI | From 5.2 | 5.2.15, 6.0.6 |
django PyPI | From 6.0.0 | 6.0.6 |
django PyPI | From 6.0.0 | 6.0.6 |
Products include Djangoproject Django.
How do I fix CVE-2026-48587?
Upgrade django to a fixed version for your release line: 5.2.15 or 6.0.6.
Is CVE-2026-48587 being exploited?
There is no known exploitation of CVE-2026-48587 in the wild and no public exploit code.
Other vulnerabilities in Djangoproject Django
- CVE-2026-4277 Privilege abuse in GenericInlineModelAdmin
- CVE-2024-53908 Django SQL injection in HasKey(lhs, rhs) on Oracle
- CVE-2024-42005 Django SQL injection vulnerability
- CVE-2023-31047 Django bypasses validation when using one form field to upload multiple files
- CVE-2022-34265 Django `Trunc()` and `Extract()` database functions vulnerable to SQL Injection
Sources
Also known as BIT-django-2026-48587, CLSA-2026-1791442732, DEBIAN-CVE-2026-48587, ECHO-d5e2-de7c-5c15, GHSA-923m-gv2p-w5qp, MINI-px8j-4448-xww2 and 3 more.