Medium 5.6Published Sep 30, 2026

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

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects Blosc C-Blosc2. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Blosc C-Blosc2

Exploited in the last 30 days

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.

CVSS: 5.6 MEDIUM (v3.1, CNA)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
Weakness (CWE): CWE-190, CWE-189
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Blosc C-Blosc2 blosc:c-blosc2	3.3.0; 3.3.1; 3.3.2; 3.3.3 not affected	CNA record

References

https://vuldb.com/vuln/411905vdb-entry, technical-description
https://vuldb.com/vuln/411905/ctisignature, permissions-required
https://vuldb.com/cve/CVE-2026-103222third-party-advisory
https://vuldb.com/submit/954976third-party-advisory
https://github.com/Blosc/c-blosc2/commit/fe2964d114d97847f56570a0ab2be2c57ccbeedcpatch
https://github.com/Blosc/c-blosc2/releases/tag/v3.3.3patch
https://github.com/Blosc/c-blosc2/product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.