CVE-2026-39892

9.8

CRITICAL CVSS 3.1

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

Overview

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.

Details

INFO

Published Date :

April 8, 2026, 9:17 p.m.

Last Modified :

April 15, 2026, 4:12 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-39892 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Cryptography.io	cryptography

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	CRITICAL				[email protected]
	CVSS 4.0	MEDIUM				[email protected]

Solution

Update the cryptography package to version 46.0.7 to fix buffer overflows.

Update the cryptography package to 46.0.7.
Verify the package version is 46.0.7 or later.

Public PoC/Exploit Available at Github

CVE-2026-39892 has a 4 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-39892.

URL	Resource
https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq	Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/04/08/12	Mailing List Release Notes Third Party Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-39892 is associated with the following CWEs:

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-39892 weaknesses.

CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-42: MIME Conversion MIME Conversion CAPEC-44: Overflow Binary Resource File Overflow Binary Resource File CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-100: Overflow Buffers Overflow Buffers CAPEC-123: Buffer Manipulation Buffer Manipulation

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

creativelaides/mcp-memory-service

Fork de https://github.com/doobidoo/mcp-memory-service para uso propio.

Python HTML Shell JavaScript PowerShell Batchfile CSS Dockerfile Slim TypeScript

Updated: 1 week, 6 days ago

0 stars 0 fork 0 watcher

Born at : April 17, 2026, 3:16 p.m. This repo has been linked 2 different CVEs too.

artabramov/hidden3

None

Dockerfile Makefile Python Shell

Updated: 21 hours, 8 minutes ago

0 stars 0 fork 0 watcher

Born at : March 28, 2026, 1:36 p.m. This repo has been linked 5 different CVEs too.

mp3wizard/notebooklm-mcp-cli

NotebookLM MCP CLI - Access NotebookLM via Claude with security fixes and FastMCP 1.0 compatibility

Python

Updated: 1 week, 1 day ago

1 stars 0 fork 0 watcher

Born at : March 18, 2026, 5:07 a.m. This repo has been linked 17 different CVEs too.

doobidoo/mcp-memory-service

Open-source persistent memory for AI agent pipelines (LangGraph, CrewAI, AutoGen) and Claude. REST API + knowledge graph + autonomous consolidation.

mcp memory semantic-search vector-database claude vector-storage sqlite-vec mcp-server model-context-protocol agent-memory agentic-ai ai-agents autogen crewai knowledge-graph langgraph long-term-memory multi-agent open-source rag

Python Dockerfile Shell HTML Slim JavaScript Batchfile PowerShell CSS TypeScript

Updated: 5 days, 9 hours ago

1728 stars 258 fork 258 watcher

Born at : Dec. 26, 2024, 10:15 a.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-39892 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-39892 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Apr. 15, 2026

Action	Type	New Value
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CPE Configuration	OR cpe:2.3:a:cryptography.io:cryptography::::::python:: versions from (including) 45.0.0 up to (excluding) 46.0.7
Added	Reference Type	CVE: http://www.openwall.com/lists/oss-security/2026/04/08/12 Types: Mailing List, Release Notes, Third Party Advisory
Added	Reference Type	GitHub, Inc.: https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq Types: Vendor Advisory

CVE Modified by af854a3a-2127-422b-91ae-364da2661108

Apr. 08, 2026

Action	Type	Old Value	New Value
Added	Reference		http://www.openwall.com/lists/oss-security/2026/04/08/12

New CVE Received by [email protected]