---
id: CVE-2026-47104
aliases:
  - PYSEC-2026-3979
title: >-
  libusb before version 1.0.30 contains a one-byte out-of-bounds read
  vulnerability in parse_iad_array() in descriptor.c that allows attack…
summary: >-
  libusb before version 1.0.30 contains a one-byte out-of-bounds read
  vulnerability in parse_iad_array() in descriptor.c that allows attackers to
  trigger a denial of service by supplying a malformed USB descriptor whose
  bLength equals size…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
vendor: libusb
product: libusb
ecosystem: pip
affected:
  - libusb < 1.0.30
patched:
  - libusb 1.0.30
published: '2026-05-27'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T12:00:03.919336692Z'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/PYSEC-2026-3979'
references:
  - url: 'https://github.com/libusb/libusb/releases/tag/v1.0.30'
  - url: 'https://github.com/libusb/libusb/issues/1813'
  - url: >-
      https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704
  - url: 'https://github.com/libusb/libusb/pull/1814'
  - url: >-
      https://www.vulncheck.com/advisories/libusb-out-of-bounds-read-in-parse-iad-array
tags:
  - osv
  - pip
epss: 0.0019
epssPercentile: 0.07664
ingestedAt: '2026-09-12T03:13:01.743Z'
---

## Overview

libusb before version 1.0.30 contains a one-byte out-of-bounds read vulnerability in parse_iad_array() in descriptor.c that allows attackers to trigger a denial of service by supplying a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size. Attackers in virtualized environments with USB passthrough can supply crafted descriptors through libusb_get_active_interface_association_descriptors or libusb_get_interface_association_descriptors to read one byte past the end of the malloc allocation, resulting in a denial of service.

## Affected packages

- `libusb < 1.0.30`

## Remediation

Upgrade to a patched release:

- `libusb 1.0.30`