UBUNTU-CVE-2026-110354

    Dashboard / Vulnerabilities / UBUNTU-CVE-2026-110354

    UBUNTU-CVE-2026-110354

    Published: 22 Oct 2026Last Modified: 3 Nov 2026
    Upstream:
    CVE-2026-110354
    Aliases:
    USN-8972-1

    Summary:

    Details: HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worker-thread CPU exhaustion) via an HTTP/1.1 chunked request. Although the H1 multiplexer drains the request before closing the stream, the parser repeatedly re-processes the same bytes without making progress. The affected thread stays busy at 100% CPU after timeouts expire and after the client disconnects, and repeated requests can consume all worker threads until the process is restarted.

    References: https://ubuntu.com/security/CVE-2026-110354, https://www.cve.org/CVERecord?id=CVE-2026-110354, 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-2026-110354 | CVE-DB