CVE-2026-8404: An issue was discovered in Django 5.2 before 5.2.15 and 6.0 before 6.0.6. `django.middleware.cache.UpdateCache

Routine

LOW 3.1UPGRADE

CVE-2026-8404 is a low-severity flaw (CVSS 3.1) affecting django. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 match `Cache-Control` response directives case-insensitively, which allows remote attackers to read responses that were incorrectly cached because their `Cache-Control` directives used uppercase or mixed-case values. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.1 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-178
Published	2026-06-03
Last modified	2026-07-21

Publisher (CNA): Django Software Foundation · Vendor: djangoproject

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-03 14:16 UTCPublished CVE record published
2026-07-21 19:10 UTCUpdated Record last modified

djangoproject django UPGRADE

Affected: >= 5.2 and < 5.2.15 · >= 6.0 and < 6.0.6

Fixed in: 5.2.15, 6.0.6

Safe to downgrade to: a release before 5.2

1. Check installed version

apt-cache policy django || rpm -q django || django --version

2. UPGRADE to 5.2.15 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade django

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade django

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 5.2 (Debian / Ubuntu)

apt-cache madison django sudo apt install django=<VERSION_BEFORE_5.2> sudo apt-mark hold django

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list django sudo dnf downgrade django-<VERSION_BEFORE_5.2> sudo dnf versionlock add django

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8404?

django: upgrade to 5.2.15, 6.0.6. Exact commands for each OS are on this page.

Is CVE-2026-8404 being exploited?

CVE-2026-8404 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8404 affect?

CVE-2026-8404 affects django. Severity is low (CVSS 3.1). 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 match `Cache-Control` response directives case-insensitively, which allows remote attackers to read

How urgent is CVE-2026-8404?

Priority 16/100. No elevated risk signals yet.

Software pages

Django vulnerabilities

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References

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