Django: DomainNameValidator permits newline characters that may enable HTTP header injection

• Vulnerabilities

__ CVE-2026-53878 Detail

Description

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.

Metrics

 

**CVSS Version 4.0

**CVSS Version 3.x

**CVSS Version 2.0

_

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

_

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

** ** N/A

NVD assessment not yet provided. _

CNA: Django Software Foundation

**CVSS-B ** 5.3 MEDIUM

Vector: 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 _

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided. _

CNA: Django Software Foundation

Base Score: 6.1 MEDIUM

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N _

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided. _

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to [email protected].

URL Source(s) Tag(s)

https://docs.djangoproject.com/en/dev/releases/security/

Django Software Foundation

Patch

Vendor Advisory

https://groups.google.com/g/django-announce

Django Software Foundation

Release Notes

https://www.djangoproject.com/weblog/2026/jul/07/security-releases/

Django Software Foundation

Patch

Vendor Advisory

Weakness Enumeration

CWE-ID CWE Name Source

CWE-144

Improper Neutralization of Line Delimiters

Django Software Foundation  

Known Affected Software Configurations Switch to CPE 2.2

_

CPEs loading, please wait.

_ _

__ Denotes Vulnerable Software

Are we missing a CPE here? Please let us know.

Change History

3 change records found show changes

** Initial Analysis by NIST 7/09/2026 8:58:17 AM **

Action Type Old Value New Value

Added CPE Configuration

OR
          *cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* versions from (including) 5.2 up to (excluding) 5.2.16
          *cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* versions from (including) 6.0 up to (excluding) 6.0.7

Added Reference Type

Django Software Foundation: https://docs.djangoproject.com/en/dev/releases/security/ Types: Patch, Vendor Advisory

Added Reference Type

Django Software Foundation: https://groups.google.com/g/django-announce Types: Release Notes

Added Reference Type

Django Software Foundation: https://www.djangoproject.com/weblog/2026/jul/07/security-releases/ Types: Patch, Vendor Advisory

** CVE Modified by CISA-ADP 7/07/2026 12:16:40 PM **

Action Type Old Value New Value

Added SSVC

{"timestamp":"2026-07-07T14:58:12.426667Z","id":"CVE-2026-53878","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

** New CVE Received from Django Software Foundation 7/07/2026 11:16:48 AM **

Action Type Old Value New Value

Added Description

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.

Added CVSS V4.0

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

Added CVSS V3.1

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Added CWE

CWE-144

Added Reference

https://docs.djangoproject.com/en/dev/releases/security/

Added Reference

https://groups.google.com/g/django-announce

Added Reference

https://www.djangoproject.com/weblog/2026/jul/07/security-releases/

Added Affected

[{"vendor":"djangoproject","product":"Django","defaultStatus":"unaffected","collectionURL":"https://pypi.org/project/Django/","packageName":"django","repo":"https://github.com/django/django/","versions":[{"version":"6.0","lessThan":"6.0.7","versionType":"python","status":"affected"},{"version":"6.0.7","versionType":"python","status":"unaffected"},{"version":"5.2","lessThan":"5.2.16","versionType":"python","status":"affected"},{"version":"5.2.16","versionType":"python","status":"unaffected"}]}]

Quick Info

CVE Dictionary Entry: CVE-2026-53878 NVD Published Date: 07/07/2026 NVD Last Modified: 07/09/2026 ** Source:** Django Software Foundation

_