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Vulnerability · Published Sep 30, 2026 · Assigned by VulDB

CVE-2026-103222Blosc C-Blosc2 blosclz Decompression blosclz.c blosclz_decompress integer overflow

Medium 5.6

In plain English

A medium-severity integer overflow in C-Blosc2 from Blosc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.6Medium
Exploit odds (30 days)0.3%top 79.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:13c-blosc2no fix listedDEBIAN-CVE-2026-103222
Debian:14c-blosc23.3.5-1DEBIAN-CVE-2026-103222
Ubuntu:24.04:LTSc-blosc2no fix listedUBUNTU-CVE-2026-103222
Ubuntu:26.04:LTSc-blosc2no fix listedUBUNTU-CVE-2026-103222
Ubuntu:26.10c-blosc2no fix listedUBUNTU-CVE-2026-103222

Affected products (as reported)

VendorProductVersions
Blosc C-Blosc2 3.3.03.3.13.3.2

Weakness: CWE-190, CWE-189 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

References