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    CVE-2026-122330

    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.

    Published:Nov 5, 2026
    Last Modified:Nov 5, 2026
    EPS:Nov 5, 2026
    EPSS Score:
    CVSS Score:5.5

    Affected Products

    Vendor
    Blosc
    Product
    C-blosc2

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-369 Divide By Zero

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2024-3203 (CVSS 7.3) — A vulnerability, which was classified as critical, was found in c-blosc2 up to 2.13.2. Affected is the functio…
    CVE-2023-37187 (CVSS 7.5) — C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the zfp/blosc2-zfp.c zfp_acc_de…
    CVE-2023-37185 (CVSS 7.5) — C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference via the function zfp_prec_decompres…
    CVE-2023-37186 (CVSS 7.5) — C-blosc2 before 2.9.3 was discovered to contain a NULL pointer dereference in ndlz/ndlz8x8.c via a NULL pointe…
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    CVE-2020-29367 (CVSS 7.8) — blosc2.c in Blosc C-Blosc2 through 2.0.0.beta.5 has a heap-based buffer overflow when there is a lack of space…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-122330 — Blosc (Medium 6.8) | CVE-DB