---
id: CVE-2021-41499
aliases:
  - GHSA-5f5c-687x-g5qm
  - PYSEC-2026-743
title: Classic Buffer Overflow in pyo
summary: Classic Buffer Overflow in pyo
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
vendor: pyo
product: pyo
ecosystem: pip
affected:
  - pyo < 1.0.3
patched:
  - pyo 1.0.3
published: '2022-01-07'
updated: '2026-07-06'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-5f5c-687x-g5qm'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2021-41499'
  - url: 'https://github.com/belangeo/pyo/issues/222'
  - url: 'https://github.com/belangeo/pyo'
tags:
  - osv
  - pip
epss: 0.01401
epssPercentile: 0.7132
ingestedAt: '2026-07-08T18:25:45.986Z'
---

## Overview

Buffer Overflow Vulnerability exists in ajaxsoundstudio.com in Pyo < 1.03 in the Server_debug function, which allows remote attackers to conduct DoS attacks by deliberately passing on an overlong audio file name.

## Affected packages

- `pyo < 1.0.3`

## Remediation

Upgrade to a patched release:

- `pyo 1.0.3`