cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00042.

Exploitation none

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Pyca Subscribe
Cryptography Subscribe

No data.

No data.

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Vendors Products
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Cryptography Subscribe
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-p423-j2cm-9vmq Cryptography vulnerable to buffer overflow if non-contiguous buffers were passed to APIs
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
http://www.openwall.com/lists/oss-security/2026/04/08/12 cve-icon cve-icon
https://github.com/pyca/cryptography/commit/622d672e429a7cff836a23c5903683dbec1901f5 cve-icon
https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-39892 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-39892 cve-icon
History

Fri, 10 Apr 2026 04:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Fri, 10 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-131
References
Metrics threat_severity

None

 cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate

Thu, 09 Apr 2026 08:30:00 +0000

Type Values Removed Values Added
First Time appeared Pyca
Pyca cryptography
Vendors & Products Pyca
Pyca cryptography

Wed, 08 Apr 2026 22:30:00 +0000

Type Values Removed Values Added
References

Wed, 08 Apr 2026 21:15:00 +0000

Type Values Removed Values Added
Description cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.
Title cryptography has a buffer overflow if non-contiguous buffers were passed to APIs
Weaknesses CWE-119
References
Metrics cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-09T19:52:22.602Z

Reserved: 2026-04-07T20:32:03.011Z

Link: CVE-2026-39892

cve-icon Vulnrichment

Updated: 2026-04-08T21:16:07.164Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-08T21:17:01.547

Modified: 2026-04-08T22:16:21.907

Link: CVE-2026-39892

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-04-08T20:49:41Z

Links: CVE-2026-39892 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-10T09:40:32Z

Weaknesses