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CVE-2026-122330Blosc c-blosc2 before 3.5.0 Divide-by-Zero via blosc2_schunk_get_slice_buffer()
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.
6.8 MEDIUMEPSS 0.23%Not in KEVNVD: Received
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 6.8 | MEDIUM | 4.0VulnCheck (CNA) | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| 5.5 | MEDIUM | 3.1VulnCheck (CNA) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Details
- CVE ID
- CVE-2026-122330
- Status
- Received
- Assigner (CNA)
- VulnCheck
- Published
- Nov 5, 2026
- Last modified
- 2026-11-05 21:18 UTC
- Weaknesses
- CWE-369 · Divide By Zero
Affected Products
As published by the CNA in the CVE record.
Bloscc-blosc21 version range
- before 3.5.0
References
- github.com https://github.com/Blosc/c-blosc2
- github.com https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/frame.c#L1214-L1227
- github.com https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/schunk.c#L1662-L1700
- github.com https://github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052
- github.com https://github.com/Blosc/c-blosc2/issues/834
- hackmd.io https://hackmd.io/@haindpwn/c-blosc2-schunk-slice-divide-by-zero
- vulncheck.com https://www.vulncheck.com/advisories/blosc-c-blosc2-before-3.5.0-divide-by-zero-via-blosc2-schunk-get-slice-buffer
- hackmd.io https://hackmd.io/@haindpwn/cve-2026-122330-c-blosc2-schunk-slice-divide-by-zero