high 7.5

CVE-2025-14550 json

Potential denial-of-service vulnerability via repeated headers when using ASGI

published 2026-02-03 9 mo ago modified 2026-09-10 59 d ago also BIT-django-2025-14550 , EUVD-2025-206739 , GHSA-33mw-q7rj-mjwj , PYSEC-2026-43

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.1%; EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits: 0; none known

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. `ASGIRequest` allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. 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 Jiyong Yang for reporting this issue.

Patch / fix

fixed in 4 distros 6 links 3

pypi django 4.2.28, 5.2.11, 6.0.2
bitnami django 4.2.28, 5.2.11, 6.0.2
djangoproject Django 4.2.28, 5.2.11, 6.0.2
djangoproject asgiref 3.11.1

debian ubuntu red hat suse opensuse alpine

python-django Debian 12 3:3.2.25-0+deb12u2
python-django Debian 13 3:4.2.28-0+deb13u1
python-django Debian 14 3:4.2.28-1

debian advisories DEBIAN-CVE-2025-14550

python-django Ubuntu 22.04 LTS 2:3.2.12-2ubuntu1.25
python-django Ubuntu 24.04 LTS 3:4.2.11-1ubuntu1.14
python-django Ubuntu 25.10 3:5.2.4-1ubuntu2.3

ubuntu advisories UBUNTU-CVE-2025-14550

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

python3.12-django satellite capsule 6.18, satellite 6.18 4.2.30-1.el9pc
python3.12-markdown satellite capsule 6.18, satellite 6.18 3.8.2-1.el9pc
python3.12-pyOpenSSL satellite capsule 6.18, satellite 6.18 26.0.0-2.el9pc
rubygem-activesupport satellite capsule 6.18, satellite 6.18 7.0.8.7-2.el9sat
receptor ansible automation platform 2.6 1.6.4-3.el10ap
receptor ansible automation platform inside 2.6, ansible automation platform developer 2.6, ansible automation platform 2.6 1.6.4-2.el9ap
receptorctl ansible automation platform 2.6 1.6.4-3.el10ap
receptorctl ansible automation platform inside 2.6, ansible automation platform developer 2.6, ansible automation platform 2.6 1.6.4-2.el9ap

red hat advisories RHSA-2026:14835 RHSA-2026:13508 RHSA-2026:5971 RHSA-2026:5970 RHSA-2026:3959 RHSA-2026:3958

python-Django SLE Module for Package Hub 15 SP7, openSUSE Leap 15.6 4.2.11-150600.3.47.1

suse advisories SUSE-SU-2026:0440-1

python-Django5 openSUSE Tumbleweed 5.2.16-1.1
python-Django4 openSUSE Tumbleweed 4.2.28-1.1
python-asgiref openSUSE Tumbleweed 3.11.1-1.1
python-Django openSUSE Leap 16.0 5.2.4-bp160.5.1
python-Django openSUSE Tumbleweed 5.2.11-1.1
python-Django6 openSUSE Tumbleweed 6.0.2-1.1

opensuse advisories openSUSE-SU-2026:11270-1 openSUSE-SU-2026:10247-1 openSUSE-SU-2026:10216-1 openSUSE-SU-2026:20184-1 openSUSE-SU-2026:10160-1 openSUSE-SU-2026:10145-1

py3-django Alpine 3.24, Alpine 3.23 4.2.28-r0

alpine advisories ALPINE-CVE-2025-14550

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

github.com/django/django@eb22e1d commit
docs.djangoproject.com/en/dev/releases/security/ advisory
djangoproject.com/weblog/2026/feb/03/security-releases/ advisory

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-2025-14550 updated 2026-11-05 cvss 7.5

Django: Django: Denial of Service via crafted request with duplicate headers

Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/lightspeed-rhel8, ansible-automation-platform-25/lightspeed-rhel8, ansible-automation-platform-26/lightspeed-rhel9
affected: workaround, no fix planned “Will not fix”
Red Hat Satellite 6 python-django, python2-django, python-django-bash-completion
affected: workaround, no fix available
Red Hat Update Infrastructure 4 for Cloud Providers python-django
affected: workaround, no fix planned “Will not fix”
Red Hat Ansible Automation Platform 2.5 for RHEL 8 python3.12-django 4.2.28-1.el8ap Red Hat Ansible Automation Platform 2.5 for RHEL 9 python3.12-django 4.2.28-1.el9ap
fixed: vendor fix RHSA-2026:3959
Red Hat Ansible Automation Platform 2.6 for RHEL 9 python3.12-django 4.2.28-1.el9ap, automation-controller 4.7.11-2.el9ap, automation-controller-ui 4.7.11-2.el9ap, automation-controller-cli 4.7.11-2.el9ap, automation-controller-server 4.7.11-2.el9ap, automation-controller-venv-tower 4.7.11-2.el9ap
fixed: vendor fix RHSA-2026:13508
Red Hat Discovery 2 discovery 1770913597
fixed: vendor fix RHSA-2026:2694
Red Hat Satellite 6.16 for RHEL 8 python-django 4.2.28-0.1.el8pc, python3.11-django 4.2.28-0.1.el8pc Red Hat Satellite 6.16 for RHEL 9 python-django 4.2.28-0.1.el9pc, python3.11-django 4.2.28-0.1.el9pc
fixed: vendor fix RHSA-2026:5971
Red Hat Satellite 6.17 for RHEL 9 libcomps 0.1.23-0.3.el9pc, satellite 6.17.7-1.el9sat, foreman 3.14.0.14-1.el9sat, python-brotli 1.2.0-0.1.el9pc, satellite-cli 6.17.7-1.el9sat, foreman-cli 3.14.0.14-1.el9sat, +29 more
fixed: vendor fix RHSA-2026:5970

show 5 more

Red Hat Satellite 6.18 satellite 1773451075
fixed: vendor fix RHSA-2026:6291
Red Hat Satellite 6.18 for RHEL 9 python3.12-django 4.2.30-1.el9pc
fixed: vendor fix RHSA-2026:14835
Red Hat Ansible Automation Platform 2 python-django, ansible-automation-platform-24/de-minimal-rhel8, ansible-automation-platform-24/de-minimal-rhel9, ansible-automation-platform-25/de-minimal-rhel8, ansible-automation-platform-25/de-minimal-rhel9, ansible-automation-platform-26/de-minimal-rhel9 Red Hat Ansible Automation Platform 2.5 for RHEL 8 tox 4.15.1-2.el8ap, uwsgi 2.0.28-2.el8ap, bindep 2.13.0-2.el8ap, receptor 1.6.3-4.el8ap, yamllint 1.35.1-2.el8ap, molecule 25.12.0-2.el8ap, +301 more Red Hat Ansible Automation Platform 2.5 for RHEL 9 tox 4.15.1-2.el9ap, uwsgi 2.0.28-2.el9ap, bindep 2.13.0-2.el9ap, receptor 1.6.3-4.el9ap, yamllint 1.35.1-2.el9ap, molecule 25.12.0-2.el9ap, +298 more Red Hat Ansible Automation Platform 2.6 for RHEL 9 tox 4.15.1-2.el9ap, uwsgi 2.0.28-2.el9ap, bindep 2.13.0-2.el9ap, receptor 1.6.3-4.el9ap, receptor 1.6.4-2.el9ap, yamllint 1.35.1-2.el9ap, +380 more Red Hat Ansible Automation Platform 2.6 for RHEL 10 receptor 1.6.3-4.el10ap, receptor 1.6.4-3.el10ap, yamllint 1.38.0-2.el10ap, receptorctl 1.6.3-4.el10ap, receptorctl 1.6.4-3.el10ap, ansible-lint 26.1.1-2.el10ap, +12 more Red Hat Discovery 2 discovery 1770913709
not affected: vulnerable code not present
Red Hat OpenStack Platform 16.2 python-django20, python3-django20, python-django20-bash-completion Red Hat OpenStack Platform 17.1 python-django, python3-django Red Hat OpenStack Platform 18.0 python-django
not affected: vulnerable code not in execute path
Red Hat Satellite 6.16 for RHEL 8 libcomps 0.1.23-0.1.el8pc, satellite 6.16.7-1.el8sat, foreman 3.12.0.14-1.el8sat, python-brotli 1.2.0-0.1.el8pc, satellite-cli 6.16.7-1.el8sat, foreman-cli 3.12.0.14-1.el8sat, +25 more Red Hat Satellite 6.16 for RHEL 9 libcomps 0.1.23-0.1.el9pc, satellite 6.16.7-1.el9sat, foreman 3.12.0.14-1.el9sat, python-brotli 1.2.0-0.1.el9pc, satellite-cli 6.16.7-1.el9sat, foreman-cli 3.12.0.14-1.el9sat, +25 more Red Hat Satellite 6.18 for RHEL 9 candlepin 4.6.5-1.el9sat, satellite 6.18.5-1.el9sat, foreman 3.16.0.16-1.el9sat, python3.12-cffi 2.0.0-1.el9pc, satellite-cli 6.18.5-1.el9sat, foreman-cli 3.16.0.16-1.el9sat, +27 more
not affected: vulnerable code not present

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: yes
Technical impact: partial
Assessed: 9 mo ago (2026-02-03)

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem	package	affected	fixed in
pypi	django	>=6.0a1, <6.0.2 >=5.2a1, <5.2.11 >=4.2a1, <4.2.28 >=4.2, <4.2.28 >=5.2, <5.2.11 >=6.0, <6.0.2	6.0.2 5.2.11 4.2.28
bitnami	django	>=4.2.0, <4.2.28 >=5.2.0, <5.2.11 >=6.0.0, <6.0.2	4.2.28 5.2.11 6.0.2

Affected products

djangoproject Django
djangoproject asgiref

Classification

Weakness

CWE-407 Inefficient Algorithmic Complexity

Technology feeds

Django rss critical rss

References

docs.djangoproject.com /en/dev/releases/security/
vendor-advisory, patch, advisory
djangoproject.com /weblog/2026/feb/03/security-releases/
vendor-advisory, patch, advisory
github.com /django/django/commit/eb22e1d6d643360e952609ef562c139a100ea4eb
web
groups.google.com /g/django-announce
mailing-list, web, release-notes, article, advisory
nvd.nist.gov /vuln/detail/CVE-2025-14550
advisory, web
docs.djangoproject.com /en/dev/releases/security
web
github.com /django/django
package
github.com /pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-43.yaml
web
djangoproject.com /weblog/2026/feb/03/security-releases
web
github.com /advisories/GHSA-33mw-q7rj-mjwj
advisory

Sources

Fencer Vulns 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.

Summary