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HIGH

CVE-2023-49083

CVSS v3

7.5

HIGH

EPSS Score

1.0 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cryptographyPyPIfrom 3.1 · fixed in 41.0.6
  • python3-cryptographyAlmaLinux:9all versions · fixed in 36.0.1-5.el9_6
  • python3-cryptographyAlmaLinux:8all versions · fixed in 3.2.1-8.el8_10
  • python3.11-cryptographyAlmaLinux:9all versions · fixed in 37.0.2-6.el9
  • python3.11-cryptographyAlmaLinux:8all versions · fixed in 37.0.2-6.el8

Vendor advisories

  • CVE-2023-49083 Red Hat Product Security182 products fixed · 8 known affected

    python-cryptography: NULL-dereference when loading PKCS7 certificates

    redhat-certification-baremetal-container as a component of Red Hat Certification for Red Hat Enterprise Linux 8 · python-cryptography.src as a component of Red Hat Enterprise Linux 7 · python2-cryptography as a component of Red Hat Enterprise Linux 7

  • RHSA-2025:15874 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: python-cryptography security update

  • RHSA-2025:14553 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: python-cryptography security update

  • RHSA-2025:13104 Red Hat Product Security21 products fixed

    Red Hat Security Advisory: python-cryptography security update

  • RHSA-2025:13103 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: python-cryptography security update

  • RHSA-2025:13100 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: python-cryptography security update

9 more advisories

Full record on NVD

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.

Technical details

Published
2023-11-29

Frequently asked questions

What is CVE-2023-49083?

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.

Is CVE-2023-49083 actively exploited?

Active exploitation of CVE-2023-49083 has not been confirmed. Its EPSS score was 1.0% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-49083?

CVE-2023-49083 has a CVSS v3 base score of 7.5 (HIGH severity).

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