---
id: CVE-2025-3159
aliases:
  - PYSEC-2025-263
title: >-
  A vulnerability, which was classified as critical, was found in Open Asset
  Import Library Assimp 5.4.3. This affects the function Assimp:…
summary: >-
  A vulnerability, which was classified as critical, was found in Open Asset
  Import Library Assimp 5.4.3. This affects the function
  Assimp::ASE::Parser::ParseLV4MeshBonesVertices of the file
  code/AssetLib/ASE/ASEParser.cpp of the component…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
vendor: pyassimp
product: pyassimp
ecosystem: pip
affected:
  - pyassimp <= 5.4.3
published: '2025-04-03'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/PYSEC-2025-263'
references:
  - url: 'https://vuldb.com/?id.303105'
  - url: 'https://vuldb.com/?submit.542247'
  - url: 'https://github.com/assimp/assimp/issues/6024'
  - url: 'https://github.com/assimp/assimp/issues/6024#issue-2877382033'
  - url: 'https://vuldb.com/?ctiid.303105'
  - url: 'https://github.com/assimp/assimp/pull/6051'
  - url: >-
      https://github.com/tellypresence/assimp/commit/e8a6286542924e628e02749c4f5ac4f91fdae71b
tags:
  - osv
  - pip
epss: 0.00328
epssPercentile: 0.26165
ingestedAt: '2026-07-13T18:58:06.867Z'
---

## Overview

A vulnerability, which was classified as critical, was found in Open Asset Import Library Assimp 5.4.3. This affects the function Assimp::ASE::Parser::ParseLV4MeshBonesVertices of the file code/AssetLib/ASE/ASEParser.cpp of the component ASE File Handler. The manipulation leads to heap-based buffer overflow. The attack needs to be approached locally. The exploit has been disclosed to the public and may be used. The identifier of the patch is e8a6286542924e628e02749c4f5ac4f91fdae71b. It is recommended to apply a patch to fix this issue.

## Affected packages

- `pyassimp <= 5.4.3`

## Remediation

Refer to the advisory for the patched release.