CVE-2026-48587
Potential exposure of private data via whitespace padding in Vary header
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.
INFO
Published Date :
June 3, 2026, 2:16 p.m.
Last Modified :
June 3, 2026, 2:16 p.m.
Remotely Exploit :
Yes !
Source :
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | LOW | 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 | ||||
| CVSS 3.1 | LOW | MITRE-CVE | ||||
| CVSS 4.0 | LOW | 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 |
Solution
- Update Django to version 5.2.15 or 6.0.6.
- Apply security patches if using older Django versions.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-48587.
| URL | Resource |
|---|---|
| https://docs.djangoproject.com/en/dev/releases/security/ | |
| https://groups.google.com/g/django-announce | |
| https://www.djangoproject.com/weblog/2026/jun/03/security-releases/ |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-48587 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-48587
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-48587 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-48587 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92
Jun. 03, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N Added CWE CWE-1023 Added Reference https://docs.djangoproject.com/en/dev/releases/security/ Added Reference https://groups.google.com/g/django-announce Added Reference https://www.djangoproject.com/weblog/2026/jun/03/security-releases/