CVE-2026-53877: Django GDALRaster May Over-read Heap Memory Vulnerability

MODERATE
Advisory Identifier: GHSA-crhf-3pfg-w68w
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CVSS 4.8
CWE-805
Published
Advisory Summary

CVE-2026-53877 is a MODERATE (CVSS 4.8) gdalraster may over-read heap memory vulnerability (CWE-805: Buffer Access with Incorrect Length Value) affecting Django libraries in the PyPI ecosystem. The issue involves gdalraster may over-read heap memory when constructed from bytes. Remediation is available by upgrading affected packages to version 5.2.16, 6.0.7.

CVE-2026-53877 at a Glance

CVE Identifier CVE-2026-53877
GHSA Identifier GHSA-crhf-3pfg-w68w
Severity MODERATE
CVSS v3.1 Base Score 4.8
CWE Classification CWE-805: Buffer Access with Incorrect Length Value
Affected Product Django
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 4.8

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

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

How to Fix CVE-2026-53877

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: 5.2.16 
pip install django>=5.2.16
django fixed: 6.0.7 
pip install django>=6.0.7
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-2026-53877, 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 5.2.16), 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-805: Buffer Access with Incorrect Length Value, where the product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer. 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 6.0.7 and 5.2 before 5.2.16. `django.contrib.gis.gdal.GDALRaster` over-reads its in-memory buffer when constructed from a bytes object, which can disclose adjacent memory or cause service degradation via a potential segmentation fault when the `vsi_buffer` property is accessed. 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.

CVE-2026-53877 Affected Django Versions

2 component(s)
Fixed Versions:
5.2.166.0.7
Product / Package Ecosystem Affected Versions Fixed Version
django
pypi/django
PyPI
< 5.2.16
5.2.16
django
pypi/django
PyPI
≥ 6.0.0
< 6.0.7
6.0.7

References

NVD — CVE-2026-53877 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53877
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/38dfbd27d7d4f4e6eaa087d7a90f2613fbf55b3a
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/6c66eb8cec52b303af85c2c6e4dd00aa37654dbc
Security Fix Commit FIX COMMIT
https://github.com/django/django/commit/6ca2bbe2efce21010eff48f1f36a3f621d698ed8
Django Release RELEASE
https://docs.djangoproject.com/en/dev/releases/security
Django Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2091.yaml
groups.google.com/g/django-announce WEB
https://groups.google.com/g/django-announce
Django Release RELEASE
https://www.djangoproject.com/weblog/2026/jul/07/security-releases

Frequently Asked Questions

What is CVE-2026-53877?
CVE-2026-53877 is a security vulnerability in Django involving GDALRaster may over-read heap memory when constructed from bytes under CWE-805: Buffer Access with Incorrect Length Value.
Which Django versions are affected?
Affected versions include releases prior to 5.2.16, 6.0.7 across affected packages: django.
What version fixes CVE-2026-53877?
Upgrading to 5.2.16, 6.0.7 (or the latest patched release for your respective branch) resolves the vulnerability.
Is django affected?
Yes, django is affected in releases prior to 5.2.16, 6.0.7. Upgrade your dependency to 5.2.16, 6.0.7 or later.
What is the CVSS score of CVE-2026-53877?
CVE-2026-53877 has a CVSS v3.1 base score of 4.8 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.
What CWE is associated with CVE-2026-53877?
CVE-2026-53877 is classified under CWE-805: Buffer Access with Incorrect Length Value (The product uses a sequential operation to read or write a buffer, but it uses an incorrect length value that causes it to access memory that is outside of the bounds of the buffer.).
How can I check PyPI dependencies for CVE-2026-53877?
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-crhf-3pfg-w68w",
  "modified" : "2026-08-07T20:01:06Z",
  "published" : "2026-07-07T15:32:57Z",
  "aliases" : [ "CVE-2026-53877" ],
  "summary" : " Django: GDALRaster may over-read heap memory when constructed from bytes",
  "details" : "An issue was discovered in Django 6.0 before 6.0.7 and 5.2 before 5.2.16.\n`django.contrib.gis.gdal.GDALRaster` over-reads its in-memory buffer when constructed from a bytes object, which can disclose adjacent memory or cause service degradation via a potential segmentation fault when the `vsi_buffer` property is accessed.\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 Bence Nagy for reporting this issue.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "django"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.2.16"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "django"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.0.7"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-53877"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/38dfbd27d7d4f4e6eaa087d7a90f2613fbf55b3a"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/6c66eb8cec52b303af85c2c6e4dd00aa37654dbc"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/django/django/commit/6ca2bbe2efce21010eff48f1f36a3f621d698ed8"
  }, {
    "type" : "WEB",
    "url" : "https://docs.djangoproject.com/en/dev/releases/security"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-2091.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/django-announce"
  }, {
    "type" : "WEB",
    "url" : "https://www.djangoproject.com/weblog/2026/jul/07/security-releases"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-805" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-07T20:01:06Z",
    "nvd_published_at" : "2026-07-07T15:16:48Z"
  }
}