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CVE-2026-103222

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

MEDIUM
5.6
CVSS Score
Published: September 30, 2026 at 02:00 PM UTC
Updated: September 30, 2026 at 05:16 PM UTC
1 product affected across 1 vendorC-Blosc2

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Severity
MEDIUM5.6
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

C-Blosc2· Blosc
60%
3.3.03.3.13.3.2
Vendor states this is fixed in 3.3.3 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (7)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/411905
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/411905/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-103222
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/954976
Patch
Source: cverecord
https://github.com/Blosc/c-blosc2/commit/fe2964d114d97847f56570a0ab2be2c57ccbeedc
Patch
Source: cverecord
https://github.com/Blosc/c-blosc2/releases/tag/v3.3.3
Product
Source: cverecord
https://github.com/Blosc/c-blosc2/

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.6MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-190CWE-189

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