CVE-2026-103222
MEDIUMDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Exploit Intelligence
Low risk: more likely to be exploited than 19% of all known CVEs.
References
Related Vulnerabilities
Other CWE-189 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2015-1538 | High | 10.0 | 99% | - | - |
| CVE-2006-3747 | High | 7.6 | 97% | - | Fix |
| CVE-2007-0071 | High | 9.3 | 93% | - | - |
| CVE-2015-3829 | High | 10.0 | 90% | - | - |
| CVE-2015-3864 | High | 10.0 | 87% | - | - |
| CVE-2015-1539 | High | 10.0 | 86% | - | - |
Common questions
How do I fix CVE-2026-103222?
Upgrade c-blosc2 on debian unstable to 3.3.5-1 or later.
Is CVE-2026-103222 being actively exploited?
Not that we know of. CVE-2026-103222 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.28% is the estimated probability that it will be exploited in the next 30 days. That is higher than 19% of all scored CVEs.
How severe is CVE-2026-103222?
CVE-2026-103222 has a CVSS v3 base score of 5.6, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-103222 affect?
Published advisories record a fix for c-blosc2 (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-30.