CVE-2026-103222 Blosc C-Blosc2 blosclz Decompression blosclz.c blosclz_decompress integer overflow
An integer overflow in the blosclz decompression function of C-Blosc2 allows remote attackers to cause a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-103222?
CVE-2026-103222 is a medium-severity vulnerability in C-Blosc2, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-103222?
How do I fix CVE-2026-103222?
Upgrade to a fixed version.
Is CVE-2026-103222 being exploited?
There is no known exploitation of CVE-2026-103222 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-103222, GHSA-c776-5v2h-x5j5, UBUNTU-CVE-2026-103222.