GHSA-mvfq-ggxm-9mc5 · Severity: high · Ecosystem: pip — Django vulnerable to ASGI header spoofing via underscore/hyphen conflation
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.
Conclusion & alert: CVE-2026-3902 is rated Moderate Risk (42.5/100): CVSS High severity, with low exploitation likelihood (EPSS 0.44%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.04% | 0.44% | +0.40% |
| 2 | 2026-04-08 | — | 0.04% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.5 | 3.1 | HIGH |
|
3.9 | 3.6 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
GHSA-mvfq-ggxm-9mc5 · Severity: high · Ecosystem: pip — Django vulnerable to ASGI header spoofing via underscore/hyphen conflation
| vendor | priority | summary | link |
|---|---|---|---|
alpine
|
— | CVE-2026-3902: 1 source package rows (py3-django); 2 state rows across 2 repos (3.23-community, edge-community); fixed 2, open 0. | https://security.alpinelinux.org/vuln/CVE-2026-3902 |
debian
|
not yet assigned | CVE-2026-3902 not yet assigned priority: Debian including 1 source packages (python-django), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-3902 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2026-3902 |
suse
|
medium | CVE-2026-3902 severity moderate: SUSE including 5 source package names (python311-Django4-4.2.30-1.1, python313-Django4-4.2.30-1.1, python313-Django6-6.0.4-1.1, python314-Django4-4.2.30-1.1, python314-Django6-6.0.4-1.1), 5 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 5. | https://www.suse.com/security/cve/CVE-2026-3902/ |
ubuntu
|
low | CVE-2026-3902 low priority: Ubuntu including 1 source packages (python-django), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): not-affected 4, released 4. | https://ubuntu.com/security/CVE-2026-3902 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| djangoproject | django | >= 4.2, < 4.2.30 | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* |
| djangoproject | django | >= 5.2, < 5.2.13 | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* |
| djangoproject | django | >= 6.0, < 6.0.4 | cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://docs.djangoproject.com/en/dev/releases/security/ | Patch Vendor Advisory |
| https://groups.google.com/g/django-announce | Release Notes |
| https://www.djangoproject.com/weblog/2026/apr/07/security-releases/ | Patch Vendor Advisory |