CVE-2024-26130: Cryptography Cryptography NULL Pointer Dereference With Vulnerability

HIGH
Advisory Identifier: GHSA-6vqw-3v5j-54x4
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CVSS 7.5
CWE-476
Published
Advisory Summary

CVE-2024-26130 is a HIGH (CVSS 7.5) cryptography null pointer dereference with vulnerability (CWE-476: NULL Pointer Dereference) affecting Cryptography libraries in the PyPI ecosystem. The issue involves cryptography null pointer dereference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override. Remediation is available by upgrading affected packages to version 42.0.4.

CVE-2024-26130 at a Glance

CVE Identifier CVE-2024-26130
GHSA Identifier GHSA-6vqw-3v5j-54x4
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-476: NULL Pointer Dereference
Affected Product Cryptography
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix CVE-2024-26130

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

cryptography fixed: 42.0.4 
pip install cryptography>=42.0.4
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 cryptography

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2024-26130, inspect your installed packages using pip:

pip show cryptography

Analyze the terminal output to locate any version of Cryptography in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 42.0.4), your application is affected.

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

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-476: NULL Pointer Dereference, where the product dereferences a pointer that it expects to be valid but is null. In Cryptography, 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

If `pkcs12.serialize_key_and_certificates` is called with both: 1. A certificate whose public key did not match the provided private key 2. An `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)` Then a NULL pointer dereference would occur, crashing the Python process. This has been resolved, and now a `ValueError` is properly raised. Patched in https://github.com/pyca/cryptography/pull/10423

CVE-2024-26130 Affected Cryptography Versions

1 component(s)
Fixed Versions:
42.0.4
Product / Package Ecosystem Affected Versions Fixed Version
cryptography
pypi/cryptography
PyPI
≥ 38.0.0
< 42.0.4
42.0.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/pyca/cryptography/security/advisories/GHSA-6vqw-3v5j-54x4
NVD — CVE-2024-26130 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-26130
Cryptography Source Repository REPOSITORY
https://github.com/pyca/cryptography/pull/10423
Security Fix Commit FIX COMMIT
https://github.com/pyca/cryptography/commit/97d231672763cdb5959a3b191e692a362f1b9e55
Cryptography Source Repository REPOSITORY
https://github.com/pyca/cryptography
Cryptography Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2024-225.yaml

Frequently Asked Questions

What is CVE-2024-26130?
CVE-2024-26130 is a security vulnerability in Cryptography involving cryptography NULL pointer dereference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override under CWE-476: NULL Pointer Dereference.
Which Cryptography versions are affected?
Affected versions include releases prior to 42.0.4 across affected packages: cryptography.
What version fixes CVE-2024-26130?
Upgrading to 42.0.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is cryptography affected?
Yes, cryptography is affected in releases prior to 42.0.4. Upgrade your dependency to 42.0.4 or later.
What is the CVSS score of CVE-2024-26130?
CVE-2024-26130 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-26130?
CVE-2024-26130 is classified under CWE-476: NULL Pointer Dereference (The product dereferences a pointer that it expects to be valid but is NULL.).
How can I check PyPI dependencies for CVE-2024-26130?
Run the dependency tree command: 'pip show cryptography'. 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-6vqw-3v5j-54x4",
  "modified" : "2025-02-06T18:07:25Z",
  "published" : "2024-02-21T18:04:40Z",
  "aliases" : [ "CVE-2024-26130" ],
  "summary" : "cryptography NULL pointer dereference with pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override",
  "details" : "If `pkcs12.serialize_key_and_certificates` is called with both:\n\n1. A certificate whose public key did not match the provided private key\n2. An `encryption_algorithm` with `hmac_hash` set (via `PrivateFormat.PKCS12.encryption_builder().hmac_hash(...)`\n\nThen a NULL pointer dereference would occur, crashing the Python process.\n\nThis has been resolved, and now a `ValueError` is properly raised.\n\nPatched in https://github.com/pyca/cryptography/pull/10423",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "cryptography"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "38.0.0"
      }, {
        "fixed" : "42.0.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/pyca/cryptography/security/advisories/GHSA-6vqw-3v5j-54x4"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2024-26130"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pyca/cryptography/pull/10423"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pyca/cryptography/commit/97d231672763cdb5959a3b191e692a362f1b9e55"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pyca/cryptography"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2024-225.yaml"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-476" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-02-21T18:04:40Z",
    "nvd_published_at" : "2024-02-21T17:15:09Z"
  }
}