High 7.5Published Nov 29, 2023

CVE-2023-49083cryptography is a package designed to expose cryptographic primitives and recipes to Python developers.

Updated under an hour ago (Nov 2, 2026, 12:23 AM ET)

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It affects cryptography.io cryptography. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

cryptography.io cryptography cryptography.io:cryptography	from 3.1 before 41.0.6	NVD

References

References

https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a	patch
https://github.com/pyca/cryptography/pull/9926	issue-tracking, patch
https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97	exploit, vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV/
https://lists.debian.org/debian-lts-announce/2024/10/msg00012.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.