---
id: CVE-2026-103222
title: A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2
summary: >-
  A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2. This impacts the
  function blosclz_decompress of the file blosc/blosclz.c of the component
  blosclz Decompression. Executing a manipulation can lead to integer overflow.
  The att…
severity: medium
cvss: 5.6
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-189
  - CWE-190
vendor: Blosc
product: C-Blosc2
affected:
  - C-Blosc2 3.3.0
  - C-Blosc2 3.3.1
  - C-Blosc2 3.3.2
published: '2026-09-30'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T16:11:41.097'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103222'
references:
  - url: 'https://github.com/Blosc/c-blosc2/'
    label: cna@vuldb.com
  - url: >-
      https://github.com/Blosc/c-blosc2/commit/fe2964d114d97847f56570a0ab2be2c57ccbeedc
    label: cna@vuldb.com
  - url: 'https://github.com/Blosc/c-blosc2/releases/tag/v3.3.3'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-103222'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/954976'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/411905'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/411905/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-30T16:25:43.440256Z'
ingestedAt: '2026-09-30T15:07:05.392Z'
---

## Overview

A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2. This impacts the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. Executing a manipulation can lead to integer overflow. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitability is said to be difficult. Upgrading to version 3.3.3 will fix this issue. This patch is called fe2964d114d97847f56570a0ab2be2c57ccbeedc. The affected component should be upgraded.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.