CVE-2026-122330

Medium

Description

Blosc c-blosc2 before 3.5.0 contains a divide-by-zero vulnerability in blosc2_schunk_get_slice_buffer() in blosc/schunk.c that allows attackers to crash applications by supplying crafted frames with unchecked zero chunksize or blocksize values. Attackers can provide a malicious Blosc2 frame opened via blosc2_schunk_open() or blosc2_schunk_from_buffer() and read as a slice, raising SIGFPE and terminating the process.

SeverityMedium

CVSS5.5

Exploit probability—

ProductC-blosc2

PublishedNov 5, 2026

First seenNov 5, 2026

Weakness typeCWE-369CWE-369

How to fix

Update

Blosc c-blosc23.5.0 or later

Patches

github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052

Affected products

Product	Affected versions	Fixed in
Blosc c-blosc2	v < 3.5.0	3.5.0

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.