Medium severity5.5NVD Advisory· Published Nov 5, 2026
CVE-2026-122330
CVE-2026-122330
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.
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Affected products
1Patches
Vulnerability mechanics
References
6- github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/frame.cnvd
- github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/schunk.cnvd
- github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052nvd
- github.com/Blosc/c-blosc2/issues/834nvd
- hackmd.io/@haindpwn/c-blosc2-schunk-slice-divide-by-zeronvd
- www.vulncheck.com/advisories/blosc-c-blosc2-before-3.5.0-divide-by-zero-via-blosc2-schunk-get-slice-buffernvd
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