ASGI header spoofing via underscore/hyphen conflation
Published Apr 7, 2026
7.5
HIGHCVSS 3.1
EPSS 0.55%
Description
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `ASGIRequest` allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. 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 Tarek Nakkouch for reporting this issue.
Affected products
-
Affected
- ≥ 4.2, < 4.2.30
- ≥ 5.2, < 5.2.13
- ≥ 6.0, < 6.0.4
Unaffected
- 4.2.30
- 5.2.13
- 6.0.4
Default status is the baseline for the product. Each version can override it (patched versions can be marked unaffected).
| Vendor | Product | Default status | Versions |
|---|---|---|---|
| Djangoproject | Django | unaffected | Affected
Unaffected
|
- ≥ 4.2 · < 4.2.30
- ≥ 5.2 · < 5.2.13
- ≥ 6.0 · < 6.0.4
No data.
Red Hat Ansible Automation Platform 2
ansible-automation-platform-24/lightspeed-rhel8-operator
Fix deferred
Red Hat Ansible Automation Platform 2
ansible-automation-platform-26/lightspeed-rhel9-operator
Fix deferred
Red Hat Ansible Automation Platform 2
automation-controller
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/automation-reports
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/controller-rhel9
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/eda-controller-rhel9
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/gateway-rhel9
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/hub-rhel9
Fix deferred
Red Hat Ansible Automation Platform 2
redhat-user-workloads/metrics-service-rhel9
Fix deferred
Red Hat Discovery 2
redhat-user-workloads/discovery-server
Fix deferred
Red Hat Satellite 6
redhat-user-workloads/iop-advisor-backend-sat-6-18
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Ansible Automation Platform 2 | ansible-automation-platform-24/lightspeed-rhel8-operator | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | ansible-automation-platform-26/lightspeed-rhel9-operator | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | automation-controller | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/automation-reports | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/controller-rhel9 | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/eda-controller-rhel9 | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/gateway-rhel9 | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/hub-rhel9 | Fix deferred | n/a |
| Red Hat Ansible Automation Platform 2 | redhat-user-workloads/metrics-service-rhel9 | Fix deferred | n/a |
| Red Hat Discovery 2 | redhat-user-workloads/discovery-server | Fix deferred | n/a |
| Red Hat Satellite 6 | redhat-user-workloads/iop-advisor-backend-sat-6-18 | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
References (11)
- https://access.redhat.com/security/cve/CVE-2026-3902 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2455935 Issue Tracking
- https://docs.djangoproject.com/en/dev/releases/security vendor-advisoryPatchVendor Advisory
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-19686 Advisory
- https://github.com/advisories/GHSA-mvfq-ggxm-9mc5 Advisory
- https://github.com/django/django/commit/caf90a971f09323775ed0cacf94eadaf39d040e0
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-51.yaml
- https://groups.google.com/g/django-announce mailing-listRelease Notes
- https://nvd.nist.gov/vuln/detail/CVE-2026-3902
- https://www.cve.org/CVERecord?id=CVE-2026-3902
- https://www.djangoproject.com/weblog/2026/apr/07/security-releases vendor-advisoryPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-3902 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2455935 | Issue Tracking | |
| https://docs.djangoproject.com/en/dev/releases/security | vendor-advisoryPatchVendor Advisory | |
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-19686 | Advisory | |
| https://github.com/advisories/GHSA-mvfq-ggxm-9mc5 | Advisory | |
| https://github.com/django/django/commit/caf90a971f09323775ed0cacf94eadaf39d040e0 | ||
| https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-51.yaml | ||
| https://groups.google.com/g/django-announce | mailing-listRelease Notes | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-3902 | ||
| https://www.cve.org/CVERecord?id=CVE-2026-3902 | ||
| https://www.djangoproject.com/weblog/2026/apr/07/security-releases | vendor-advisoryPatchVendor Advisory |
Change history (0)
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