CVE
CVE-2026-39892
Cryptography vulnerable to buffer overflow if non-contiguous buffers were passed to APIs
If a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. For example:
h = Hash(SHA256())
b.update(buf[::-1])would read past the end of the buffer on Python >3.11
Package Versions Affected
Package Version
patch Availability
No items found.
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CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
6.9
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-
Related Resources
No items found.
References
https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq, https://nvd.nist.gov/vuln/detail/CVE-2026-39892, https://github.com/pyca/cryptography, http://www.openwall.com/lists/oss-security/2026/04/08/12
Basic Information
Ecosystem
