EUVD-2026-20640
GHSA-p423-j2cm-9vmq
6.9
CVSS 4.0
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CVSS 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/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X
Lifecycle Timeline
4
Patch Released
Apr 09, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 08, 2026 - 19:31 euvd
EUVD-2026-20640
Analysis Generated
Apr 08, 2026 - 19:31 vuln.today
CVE Published
Apr 08, 2026 - 19:23 nvd
MEDIUM 6.9
Tags
Description
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: ```python h = Hash(SHA256()) b.update(buf[::-1]) ``` would read past the end of the buffer on Python >3.11
Analysis
Buffer overflow in pyca/cryptography library allows reading past allocated memory when non-contiguous Python buffers (such as reversed slices) are passed to cryptographic APIs like Hash.update() on Python 3.11+. Attackers can trigger memory disclosure or denial of service by crafting malformed buffer objects, affecting any application using the cryptography package with vulnerable buffer handling.
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Priority Score
34
Low
Medium
High
Critical
KEV: 0
EPSS: +0.0
CVSS: +34
POC: 0
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External POC / Exploit Code
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