CVE-2026-6873: Django Signed Cookies Are Vulnerable To Vulnerability

LOW
Advisory Identifier: GHSA-h7pc-vwp9-298g
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CVSS 3.1
CWE-347
Published
Advisory Summary

CVE-2026-6873 is a LOW (CVSS 3.1) signed cookies are vulnerable to vulnerability (CWE-347: Improper Verification of Cryptographic Signature) affecting Django libraries in the PyPI ecosystem. The issue involves signed cookies are vulnerable to salt namespace collisions. Remediation is available by upgrading affected packages to version 5.2.15, 6.0.6.

CVE-2026-6873 at a Glance

CVE Identifier CVE-2026-6873
GHSA Identifier GHSA-h7pc-vwp9-298g
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-347: Improper Verification of Cryptographic Signature
Affected Product Django
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 3.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-6873

To remediate this vulnerability, upgrade all affected Django dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

django fixed: 5.2.15 
pip install django>=5.2.15
django fixed: 6.0.6 
pip install django>=6.0.6
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show django

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-6873, inspect your installed packages using pip:

pip show django

Analyze the terminal output to locate any version of Django in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.2.15), your application is affected.

Note: The pip show django command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-347: Improper Verification of Cryptographic Signature, where the product does not verify, or incorrectly verifies, the cryptographic signature for data. In Django, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15. `django.http.HttpRequest.get_signed_cookie` in Django uses a non-injective salt derivation (concatenating the cookie name and salt argument), which allows a remote attacker to use a cookie in a context different from the one where it was signed, via distinct `(name, salt)` pairs that produce the same concatenation. 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 Peng Zhou for reporting this issue.

CVE-2026-6873 Affected Django Versions

2 component(s)
Fixed Versions:
5.2.156.0.6
Product / Package Ecosystem Affected Versions Fixed Version
django
pypi/django
PyPI
< 5.2.15
5.2.15
django
pypi/django
PyPI
≥ 6.0.0
< 6.0.6
6.0.6

References

NVD — CVE-2026-6873 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6873
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/594360cbf58be7f56eb6da96d58644297c99ef85
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/70d36515b9cc71700105a14b275583070d48b689
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/c807d9c398022d23cb27518fa6ecaf343efb30cf
Django Release RELEASE
https://docs.djangoproject.com/en/dev/releases/security
Django Source Repository REPOSITORY
https://github.com/django/django
Django Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-199.yaml
groups.google.com/g/django-announce WEB
https://groups.google.com/g/django-announce
Django Release RELEASE
https://www.djangoproject.com/weblog/2026/jun/03/security-releases

Frequently Asked Questions

What is CVE-2026-6873?
CVE-2026-6873 is a security vulnerability in Django involving signed cookies are vulnerable to salt namespace collisions under CWE-347: Improper Verification of Cryptographic Signature.
Which Django versions are affected?
Affected versions include releases prior to 5.2.15, 6.0.6 across affected packages: django.
What version fixes CVE-2026-6873?
Upgrading to 5.2.15, 6.0.6 (or the latest patched release for your respective branch) resolves the vulnerability.
Is django affected?
Yes, django is affected in releases prior to 5.2.15, 6.0.6. Upgrade your dependency to 5.2.15, 6.0.6 or later.
What is the CVSS score of CVE-2026-6873?
CVE-2026-6873 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N.
What CWE is associated with CVE-2026-6873?
CVE-2026-6873 is classified under CWE-347: Improper Verification of Cryptographic Signature (The product does not verify, or incorrectly verifies, the cryptographic signature for data.).
How can I check PyPI dependencies for CVE-2026-6873?
Run the dependency tree command: 'pip show django'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-h7pc-vwp9-298g",
  "modified" : "2026-08-07T20:04:27Z",
  "published" : "2026-06-03T15:30:43Z",
  "aliases" : [ "CVE-2026-6873" ],
  "summary" : "Django: signed cookies are vulnerable to salt namespace collisions",
  "details" : "An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.\n`django.http.HttpRequest.get_signed_cookie` in Django uses a non-injective salt derivation (concatenating the cookie name and salt argument), which allows a remote attacker to use a cookie in a context different from the one where it was signed, via distinct `(name, salt)` pairs that produce the same concatenation.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Peng Zhou for reporting this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
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      "name" : "django"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
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      } ]
    } ]
  }, {
    "package" : {
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      "name" : "django"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
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      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-6873"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/594360cbf58be7f56eb6da96d58644297c99ef85"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/70d36515b9cc71700105a14b275583070d48b689"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/c807d9c398022d23cb27518fa6ecaf343efb30cf"
  }, {
    "type" : "WEB",
    "url" : "https://docs.djangoproject.com/en/dev/releases/security"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/django/django"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-199.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/django-announce"
  }, {
    "type" : "WEB",
    "url" : "https://www.djangoproject.com/weblog/2026/jun/03/security-releases"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-347" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-07T20:04:27Z",
    "nvd_published_at" : "2026-06-03T14:16:46Z"
  }
}