---
id: CVE-2026-118447
title: Uninitialized INSTRUX contents returned after decoding failure in pybddisasm
summary: >-
  A use of uninitialized memory vulnerability in the pybddisasm Python bindings
  may disclose process memory when instruction decoding fails. The nd_decode,
  nd_decode_ex, nd_decode_ex2, and nd_decode_with_context functions may return
  an INS…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-457
vendor: Bitdefender
product: pybddisasm
affected:
  - pybddisasm <= 0.3.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-03T17:23:50.394004Z'
published: '2026-11-03'
updated: '2026-11-03'
sourceUpdated: '2026-11-03T18:32:24.225Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118447'
references:
  - url: 'https://pypi.org/project/pybddisasm/'
tags:
  - cve.org
epss: 0.00105
epssPercentile: 0.0105
ingestedAt: '2026-11-05T20:33:06.363Z'
---

## Overview

A use of uninitialized memory vulnerability in the pybddisasm Python bindings may disclose process memory when instruction decoding fails. The nd_decode, nd_decode_ex, nd_decode_ex2, and nd_decode_with_context functions may return an INSTRUX object whose contents have not been initialized after an unsuccessful decoding operation, including failures caused by invalid parameters. Accessing members of the returned object may expose residual process memory. Exploitation requires an application to access and expose the returned object contents after a decoding failure. The pybddisasm package is no longer maintained.

## Affected

- `pybddisasm <= 0.3.0`

## Remediation

Discontinue use of the unmaintained pybddisasm package. No fixed release will become available.