CVE-2023-49083

Aliases:GHSA-jfhm-5ghh-2f97PYSEC-2023-254
Advisory lineage Upstream: 0 Downstream: 25
Modified
Published: 29 Nov 2023, 18:50
Last modified:18 Dec 2025, 15:32

Vulnerability Summary

Overall Risk (default)
medium
40/100
CVSS Score
7.5 HIGH
v3.1 (nvd)
EPSS Score
1.26% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
1 found
Dark Web
Not detected

Timeline

29 Nov 2023, 18:50
Published
Vulnerability first disclosed
18 Dec 2025, 15:32
Last Modified
Vulnerability information updated

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.

CVSS Metrics

  • v3.1•MEDIUM•Score: 5.9CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 1.26%• Percentile: 80%

Techniques & Countermeasures

  • CWE-476•NULL Pointer Dereference

    The product dereferences a pointer that it expects to be valid but is NULL.

Affected Systems

  • cryptography.io•cryptography

    ≥ 3.1, < 41.0.6

  • pyca•cryptography

    ≥ 3.1, < 41.0.6

  • PyPI•cryptography

    < f09c261ca10a31fe41b1262306db7f8f1da0e48a | ≥ 3.1, < 41.0.6

References (10)