UBUNTU-CVE-2026-122127

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    UBUNTU-CVE-2026-122127

    Published: 5 Nov 2026Last Modified: 6 Nov 2026
    Upstream:
    CVE-2026-122127

    Summary:

    Details: CESNET ipfixcol2 2.7.1 before 2.9.0 contains a heap-based buffer overflow in Lz4Decoder.cpp that allows unauthenticated network peers to write past heap buffers. Attackers can declare a small ring buffer_size followed by a large decompressed_size to write up to 65535 controlled bytes and crash the collector.

    References: https://ubuntu.com/security/CVE-2026-122127, https://www.cve.org/CVERecord?id=CVE-2026-122127, https://github.com/CESNET/ipfixcol2, https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cpp#L139-L151, https://github.com/CESNET/ipfixcol2/commit/fd5cb168efb4b864d33f655174711b2779cef502, https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0, https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.7.1-before-2.9.0-heap-buffer-overflow-via-tcp-lz4-decoder

    Affected packages

    Package

    Name: ipfixcol2

    Purl: pkg:deb/ubuntu/ipfixcol2?arch=source&distro=stonking

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.8.0+20260519-1
    2.8.0+20260519-2
    2.8.0+20260701-1

    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
    UBUNTU-CVE-2026-122127 | CVE-DB