All vulnerabilities
CVE-2026-103222

Blosc C-Blosc2 blosclz Decompression blosclz.c blosclz_decompress integer overflow

Blosc C-Blosc2
Open in ThreatlineRecord JSON
CVSS
6.3Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.28%Chance of exploitation activity in the next 30 days, higher than 19% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published30 Sep 2026Updated 30 Sep 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

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.

Text from CVE List

Affected versions 4

  • C-Blosc2affected: 3.3.0CVE List
  • C-Blosc2affected: 3.3.1CVE List
  • C-Blosc2affected: 3.3.2CVE List
  • C-Blosc2unaffected: 3.3.3CVE List

References 7