Bug 2567901 (CVE-2026-122330)

Summary: CVE-2026-122330 c-blosc2: c-blosc2: Denial of Service via divide-by-zero in slice processing
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in c-blosc2. This vulnerability allows an attacker to cause a Denial of Service (DoS) by providing a specially crafted compressed data frame containing zero chunk or block size values. When an application attempts to read a data slice from the malicious frame, an unhandled division-by-zero error triggers an abnormal process crash.
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Description OSIDB Bzimport 2026-11-05 22:35:02 UTC 
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.