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CVE-2026-39892

cryptography has a buffer overflow if non-contiguous buffers were passed to APIs

Published: Apr 8, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-119
9.8CRITICAL
NVD MITRE
EPSS Score
0.7%
Top 52.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-119CWE-131

Affected Products

pyca
oss-project·GBaka pyca/cryptography, py ca
cryptographyLibrary
OSS Libraries / pypi
cryptography.io
oss-projectaka cryptography
cryptographyLibrary
OSS Libraries / pypi

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq
github.com
http://www.openwall.com/lists/oss-security/2026/04/08/12
openwall.com
https://access.redhat.com/errata/RHSA-2026:19375
access.redhat.com
and 27 more references View all →

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