GHSA-8qcx-xf44-272x BIT-django-2026-53878 CVE-2026-53878 PYSEC-2026-2092
Django: DomainNameValidator permits newline characters that may enable HTTP header injection
- Severity
- 0.0 / 10
- Medium · CVSS 4.0
- Exploit chance (EPSS)
- 0.33%
- Chance of exploitation in the next 30 days. Higher than 25.81% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-144 Improper Neutralization of Line Delimiters
- Fix
5.2.16- Upgrade django to this version or later
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.
Affected versions
PyPI
| Package | Vulnerable | Fixed in |
|---|---|---|
| django | < 5.2.16 |
5.2.16 |
| django | >= 6.0.0, < 6.0.7 |
6.0.7 |
| django | >= 5.2, < 5.2.16>= 6.0, < 6.0.7 |
5.2.166.0.7 |
How to fix
Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.
django PyPI → 5.2.16
- pip
pip install --upgrade "django>=5.2.16"- poetry
poetry add "django>=5.2.16"- uv
uv add "django>=5.2.16"
Severity breakdown
CVSS 4.0 0.0
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
- Attack vector
- Network
- Attack complexity
- Low
- Attack requirements
- None
- Privileges required
- None
- User interaction
- Passive
- Confidentiality (vulnerable system)
- None
- Integrity (vulnerable system)
- None
- Availability (vulnerable system)
- None
- Confidentiality (subsequent systems)
- Low
- Integrity (subsequent systems)
- Low
- Availability (subsequent systems)
- None
CVSS 3.1 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Weakness
CWE-144: Improper Neutralization of Line Delimiters
The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could be interpreted as line delimiters when they are sent to a downstream component.
How to prevent it
- Developers should anticipate that line delimiters will be injected/removed/manipulated in the input vectors of their product. Use an appropriate combination of denylists and allowlists to ensure only valid, expected and appropriate input is processed by the system.
- Implementation: Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does. When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue." Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
- Implementation: While it is risky to use dynamically-generated query strings, code, or commands that mix control and data together, sometimes it may be unavoidable. Properly quote arguments and escape any special characters within those arguments. The most conservative approach is to escape or filter all characters that do not pass an extremely strict allowlist (such as everything that is not alphanumeric or white space). If some special characters are still needed, such as white space, wrap each argument in quotes after the escaping/filtering step. Be careful of argument injection (CWE-88).
- Implementation: Inputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
References
Advisories
Fixes and patches
Packages
Other links
- github.com/django/django/commit/3a720d0d8bf2529253b98968f10ca73daf6d693c
- github.com/django/django/commit/a5de13f1491f1dbf2bb0ad9b91570524ebbc8acd
- github.com/django/django/commit/d5d60ed0323cddaa0ce0237a26a3d49ac21ee05e
- docs.djangoproject.com/en/dev/releases/security
- github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2092.yaml
- groups.google.com/g/django-announce
- djangoproject.com/weblog/2026/jul/07/security-releases
Timeline
- Published
- Last updated by the source
- Latest EPSS score
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| GHSA-h7pc-vwp9-298g Django: signed cookies are vulnerable to salt namespace collisions | Medium | Also affects django |
| GHSA-923m-gv2p-w5qp Django: has_vary_header may expose cached responses when Vary values contain whitespace | Medium | Also affects django |
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