{"id":"CVE-2023-49083","aliases":["GHSA-jfhm-5ghh-2f97","PYSEC-2023-254"],"url":"https://o3.security/vulnerability/CVE-2023-49083","summary":"cryptography vulnerable to NULL-dereference when loading PKCS7 certificates","details":"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.","published":"2023-11-29T18:50:24.263Z","modified":"2026-08-07T10:11:59.370224592Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00985,"percentile":0.58998,"asOf":"2026-08-06"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"cryptography","fixedVersion":"41.0.6"}],"fix":{"url":"https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a","label":"pyca/cryptography@f09c261"},"references":[{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/10/msg00012.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/49xxx/CVE-2023-49083.json"},{"type":"ADVISORY","url":"https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-49083"},{"type":"FIX","url":"https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a"},{"type":"FIX","url":"https://github.com/pyca/cryptography/pull/9926"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T10:11:59.370224592Z"}}