EUVD-2026-42045
GHSA-8qcx-xf44-272x
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
AC:H reflects the non-default application pattern required - direct DomainNameValidator use bypassing both CharField and HttpResponse protections; remaining metrics mirror standard header injection impact.
Primary rating from Vendor (DSF).
CVSS VectorVendor: DSF
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Lifecycle Timeline
3Blast Radius
ecosystem impact- 12 pypi packages depend on django (12 direct, 0 indirect)
Ecosystem-wide dependent count for version 5.2.
DescriptionCVE.org
An issue was discovered in Django 6.0 before 6.0.7 and 5.2 before 5.2.16. DomainNameValidator does not prohibit newlines in domain names (unless used via a form field, since CharField strips newlines). If an application uses values with newlines in an HTTP response, header injection can occur. Django itself is unaffected because HttpResponse prohibits newlines in HTTP 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 Bence Nagy for reporting this issue.
AnalysisAI
Header injection in Django's DomainNameValidator allows network attackers to inject arbitrary HTTP response headers when applications pass validator-accepted domain values directly into HTTP responses, affecting Django 6.0 before 6.0.7 and 5.2 before 5.2.16. The validator silently accepts embedded newline characters in domain name strings, enabling HTTP response splitting that can facilitate session hijacking, open redirects, or cross-site scripting against end users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two simultaneous application-level conditions are required: (1) the application invokes DomainNameValidator (or a model field that uses it) directly on user-controlled input without routing through a Django form backed by CharField, since CharField.clean() strips newlines before validation occurs; AND (2) the validator-accepted domain string is inserted into an HTTP response header via a raw WSGI/ASGI response mechanism that bypasses Django's own HttpResponse API, which independently rejects newline characters in header values. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD-assigned CVSS 3.1 score of 6.1 (Medium) with vector AV:N/AC:L/PR:N/UI:R/S:C reflects a realistic worst case where a network attacker with no privileges manipulates a header that affects a victim's browser session. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker submits a crafted domain value containing an embedded CRLF sequence (e.g., legitimate.com\r\nSet-Cookie: session=attacker) to a Django application that validates it with DomainNameValidator and then writes the result into an HTTP response header via a raw WSGI/ASGI response path rather than through HttpResponse. The server delivers the response to a victim user whose browser parses the injected header - honoring the forged Set-Cookie, Location redirect, or similar directive - enabling session fixation or open redirect exploitation. … |
| Remediation | Upgrade to Django 6.0.7 or Django 5.2.16, released by the Django Software Foundation on 2026-07-07 and documented at https://www.djangoproject.com/weblog/2026/jul/07/security-releases/. … Detailed patch versions, workarounds, and compensating controls in full report. |
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View allSame technique Code Injection
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External POC / Exploit Code
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