How severe is CVE-2026-6907?

No CVSS score has been assigned to CVE-2026-6907 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-6907?

CVE-2026-6907 affects the following packages: django (PyPI), django (PyPI). Ecosystems affected: PyPI.

How do I fix CVE-2026-6907?

Update django to 6.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-6907 is resolved across your whole dependency graph.

How do I detect CVE-2026-6907 in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-6907 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-6907 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-6907 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-6907?

CVE-2026-6907 has an EPSS (Exploit Prediction Scoring System) score of 0.4%, placing it in the 30th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-6907?

CVE-2026-6907 is classified as CWE-524 (CWE-524). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-6907 published, and has it been updated?

CVE-2026-6907 was published on May 5, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

Not in CISA KEV

CVE-2026-6907 — django

CVE-2026-6907 is a CWE-524 vulnerability in django. A fix is available for django — see the affected versions and patch details below.

Potential exposure of private data due to incorrect handling of Vary: * in UpdateCacheMiddleware

Also known asBIT-django-2026-6907GHSA-5hrc-gvxj-w55pPYSEC-2026-55

Published

May 5, 2026

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-6907.

EPSS Exploitation Probability

via FIRST.org ↗

0.4%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs30th percentile — riskier than 30% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

2 pkgs affected

🐍django🐍django

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

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

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`django`	≥ 6.0&&< 6.0.5	6.0.5`pip install --upgrade 'django==6.0.5'`
🐍PyPI	`django`	≥ 5.2&&< 5.2.14	5.2.14`pip install --upgrade 'django==5.2.14'`

Affected Products

1 product · 2 configurations

Application

djangodjangoproject

≥ 6.0 && < 6.0.5

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update django to 6.0.5 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-6907 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

Workaround published by Red Hat

To mitigate this issue, disable the `django.middleware.cache.UpdateCacheMiddleware` in your Django application's `settings.py` file by removing it from the `MIDDLEWARE` list. This action prevents the erroneous caching of requests with an asterisk in the `Vary` header, thereby eliminating the information disclosure vulnerability. Be aware that disabling this middleware will also deactivate Django's built-in caching functionality, which may affect application performance and behavior. A restart of the Django application server is required for this change to take effect.

Source: Red Hat security advisory for CVE-2026-6907 (CC BY 4.0)

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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