{"cve":"CVE-2023-49083","nvd":{"published":"2023-11-29T19:15:07.967","modified":"2026-06-17T06:35:19.820","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-476"],"references":["https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a","https://github.com/pyca/cryptography/pull/9926","https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV/","https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a"],"products":["cryptography.io:cryptography"],"source":"nvd","synced_at":"2026-10-19T21:42:07.670898610+00:00"},"epss":{"cve":"CVE-2023-49083","score":0.00985,"percentile":0.6236,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jfhm-5ghh-2f97","url":"https://osv.dev/vulnerability/GHSA-jfhm-5ghh-2f97","summary":"cryptography vulnerable to NULL-dereference when loading PKCS7 certificates","modified":"2026-09-10T03:49:59.095260608Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":[">=3.1 <41.0.6"],"fixed":["41.0.6"]}]},{"id":"PYSEC-2023-254","url":"https://osv.dev/vulnerability/PYSEC-2023-254","summary":"","modified":"2024-02-17T07:41:40.326359Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":[">=3.1 <41.0.6"],"fixed":["41.0.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}