UBUNTU-CVE-2026-110353

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    UBUNTU-CVE-2026-110353

    Published: 22 Oct 2026Last Modified: 3 Nov 2026
    Upstream:
    CVE-2026-110353
    Aliases:
    USN-8972-1

    Summary:

    Details: HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread CPU exhaustion) via a truncated HTTP/2 PING frame. h2c_handle_ping in src/mux_h2.c does not check for a short read, unlike the other H2 frame handlers. Because the incomplete frame cannot be processed, its data is never consumed, and the H2 multiplexer tasklet is repeatedly woken by that pending data without making progress. The CPU spins until timeout http-request closes the connection, and an attacker opening many such connections can sustain high CPU usage.

    References: https://ubuntu.com/security/CVE-2026-110353, https://www.cve.org/CVERecord?id=CVE-2026-110353, https://ubuntu.com/security/notices/USN-8972-1

    Affected packages

    Package

    Name: haproxy

    Purl: pkg:deb/ubuntu/haproxy?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.5.14-1
    1.5.15-1

    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-2026-110353 | CVE-DB