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Fencer Intel
low 3.1

CVE-2026-8404 json

Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddleware

published 5mo ago modified last mo. also BIT-django-2026-8404 , EUVD-2026-34088 , GHSA-8cjm-8mp7-r2xf , PYSEC-2026-201

cvss
3.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

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 may also be affected. Django would like to thank Ahmed Badawe for reporting this issue.

Patch / fix

  • pypi django 5.2.15, 6.0.6
  • bitnami django 5.2.15, 6.0.6
  • djangoproject Django 5.2.15, 6.0.6
  • python-django Debian 14 3:5.2.15-1

debian advisories DEBIAN-CVE-2026-8404

  • python-django Ubuntu 22.04 LTS 2:3.2.12-2ubuntu1.29
  • python-django Ubuntu 24.04 LTS 3:4.2.11-1ubuntu1.18
  • python-django Ubuntu 26.04 LTS 3:5.2.9-0ubuntu4.3
  • python-django Ubuntu Pro 20.04 LTS 2:2.2.12-1ubuntu0.29+esm10

ubuntu advisories UBUNTU-CVE-2026-8404

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-Django SLE Module for Package Hub 15 SP7 4.2.11-150600.3.59.1

suse advisories SUSE-SU-2026:2318-1

  • python-Django5 openSUSE Tumbleweed 5.2.16-1.1
  • python-Django openSUSE Tumbleweed 5.2.15-1.1
  • python-Django6 openSUSE Tumbleweed 6.0.6-1.1
  • python-Django openSUSE Leap 16.0 5.2.4-bp160.9.1
  • python-Django4 openSUSE Tumbleweed 4.2.30-3.1

opensuse advisories openSUSE-SU-2026:11270-1openSUSE-SU-2026:11002-1openSUSE-SU-2026:11003-1openSUSE-SU-2026:20937-1openSUSE-SU-2026:10989-1

  • py3-django Alpine 3.24 5.2.15-r0

alpine advisories ALPINE-CVE-2026-8404

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Is CVE-2026-8404 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-8404 updated cvss 3.1

Django: Django: Information disclosure due to improper handling of Cache-Control directives

  • Red Hat Ansible Automation Platform 2 automation-controller, ansible-automation-platform-26/hub-rhel9, ansible-automation-platform-27/hub-rhel9, ansible-automation-platform-26/gateway-rhel9, ansible-automation-platform-27/gateway-rhel9, ansible-automation-platform-24/lightspeed-rhel8, +11 more Red Hat Discovery 2 discovery/discovery-server-rhel9 Red Hat Satellite 6 satellite/iop-advisor-backend-rhel9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Self-service automation portal 2 ansible-automation-platform/bootc-automation-portal-rhel9
    under investigation

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA 4.0 2.3 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
GitHub 3.1 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA 4.0 2.3 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/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
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
OSV 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
pypi django
<5.2.15
>=6.0.0, <6.0.6
>=5.2, <5.2.15
>=6.0, <6.0.6
5.2.15
6.0.6
bitnami django
>=5.2.0, <5.2.15
>=6.0.0, <6.0.6
5.2.15
6.0.6

Affected products

  • djangoproject Django

Classification

Weakness
  • CWE-178 Improper Handling of Case Sensitivity
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.