CVE-2026-122330

    Dashboard / Vulnerabilities / CVE-2026-122330

    CVE-2026-122330

    Published: 5 Nov 2026Last Modified: 7 Nov 2026

    Summary: Blosc c-blosc2 before 3.5.0 Divide-by-Zero via blosc2_schunk_get_slice_buffer()

    Details: 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.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/122xxx/CVE-2026-122330.json, https://hackmd.io/@haindpwn/c-blosc2-schunk-slice-divide-by-zero, https://nvd.nist.gov/vuln/detail/CVE-2026-122330, https://www.vulncheck.com/advisories/blosc-c-blosc2-before-3.5.0-divide-by-zero-via-blosc2-schunk-get-slice-buffer, https://github.com/Blosc/c-blosc2/issues/834, https://github.com/Blosc/c-blosc2/commit/4fff1787408d94b895c6f9cb50f7925ad5919052, https://github.com/Blosc/c-blosc2, https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/frame.c#L1214-L1227, https://github.com/Blosc/c-blosc2/blob/v3.4.1/blosc/schunk.c#L1662-L1700, https://hackmd.io/@haindpwn/cve-2026-122330-c-blosc2-schunk-slice-divide-by-zero

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -4d35a0dbeee037c0c724a96a8e5ed9b07c31b67f

    Affected versions

    v3.4.1
    v3.4.0

    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 | CVE-DB