UBUNTU-CVE-2026-122129

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    UBUNTU-CVE-2026-122129

    Published: 5 Nov 2026Last Modified: 6 Nov 2026
    Upstream:
    CVE-2026-122129

    Summary:

    Details: CESNET ipfixcol2 2.7.1 before 2.9.0 contains a memory allocation vulnerability in Lz4Decoder::read_start_header() that allows unauthenticated attackers to exhaust memory by declaring unbounded ring buffer sizes. Attackers can open TCP connections sending LZ4 start headers with very large buffer sizes, forcing up to 4 GiB allocations per connection and denying collector service.

    References: https://ubuntu.com/security/CVE-2026-122129, https://www.cve.org/CVERecord?id=CVE-2026-122129, https://github.com/CESNET/ipfixcol2, https://github.com/CESNET/ipfixcol2/blob/v2.8.0/src/plugins/input/tcp/src/Lz4Decoder.cpp#L126-L131, https://github.com/CESNET/ipfixcol2/commit/1a199033eff847941353c5c039cb806a9ad8aa6f, https://github.com/CESNET/ipfixcol2/releases/tag/v2.9.0, https://www.vulncheck.com/advisories/cesnet-ipfixcol2-2.7.1-before-2.9.0-memory-exhaustion-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-2026-122129 | CVE-DB