GHSA-923m-gv2p-w5qp BIT-django-2026-48587 CVE-2026-48587 PYSEC-2026-198
Django: has_vary_header may expose cached responses when Vary values contain whitespace
- Severity
- 0.0 / 10
- Medium · CVSS 4.0
- Exploit chance (EPSS)
- 0.37%
- Chance of exploitation in the next 30 days. Higher than 30.55% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-1023 Incomplete Comparison with Missing Factors
- Fix
5.2.15- Upgrade django to this version or later
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.
Affected versions
PyPI
| Package | Vulnerable | Fixed in |
|---|---|---|
| django | < 5.2.15 |
5.2.15 |
| django | >= 6.0.0, < 6.0.6 |
6.0.6 |
| django | >= 5.2, < 5.2.15>= 6.0, < 6.0.6 |
5.2.156.0.6 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
django PyPI → 5.2.15
- pip
pip install --upgrade "django>=5.2.15"- poetry
poetry add "django>=5.2.15"- uv
uv add "django>=5.2.15"
Severity breakdown
CVSS 4.0 0.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- Present
- Privileges required
- None
- User interaction
- Passive
- Confidentiality (vulnerable system)
- Low
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- None
- Confidentiality (subsequent systems)
- None
- Integrity (subsequent systems)
- None
- Availability (subsequent systems)
- None
CVSS 3.1 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- None
- Availability
- None
Weakness
CWE-1023: Incomplete Comparison with Missing Factors
The product performs a comparison between entities that must consider multiple factors or characteristics of each entity, but the comparison does not include one or more of these factors.
References
Advisories
Fixes and patches
Packages
Other links
- github.com/django/django/commit/1721035a72624aad7b38dd19b14013efd94b24b8
- github.com/django/django/commit/42aa0b3364d312e7c6472258d8b0e9c0277fbf22
- github.com/django/django/commit/9b62b0af71a14c657d19d95371630ba839e83d9a
- docs.djangoproject.com/en/dev/releases/security
- github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-198.yaml
- groups.google.com/g/django-announce
- djangoproject.com/weblog/2026/jun/03/security-releases
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| Advisory | Severity | Why it's related |
|---|---|---|
| GHSA-q238-5cxm-5c9h Django GeoDjango vulnerable to denial of service through deeply nested geometry collections | Medium | Also affects django |
| GHSA-wvqv-fj8w-qmhm Django GeoDjango spatial lookups allow file writes and outbound requests through GDAL raster parsing | High | Also affects django |
| GHSA-8qcx-xf44-272x Django: DomainNameValidator permits newline characters that may enable HTTP header injection | Medium | Also affects django |
| GHSA-crhf-3pfg-w68w Django: GDALRaster may over-read heap memory when constructed from bytes | Medium | Also affects django |
| GHSA-3h9f-r86x-qvjx Django: cache middleware may expose private responses when unrelated request cookies are present | Medium | Also affects django |
| GHSA-8cjm-8mp7-r2xf Django: UpdateCacheMiddleware may disclose cached responses due to case-sensitive Cache-Control handling | Medium | Also affects django |
| GHSA-mm6v-q8q9-pgcf Django fails to prevent reuse of a partially-initialized connection after a failed `STARTTLS` handshake | Low | Also affects django |
| GHSA-h7pc-vwp9-298g Django: signed cookies are vulnerable to salt namespace collisions | Medium | Also affects django |
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