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    CVE-2026-110354

    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.

    Published:Oct 22, 2026
    Last Modified:Oct 22, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00762
    CVSS Score:7.5

    Affected Products

    Vendor
    Haproxy
    Product
    Haproxy
    Vendor
    Haproxy
    Product
    Haproxy Enterprise
    Vendor
    Haproxy
    Product
    Kubernetes Ingress Controller
    Vendor
    Haproxy
    Product
    Kubernetes Ingress Controller Enterprise

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-110353 (CVSS 7.5) — HAProxy 3.2 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (worker-thread …
    CVE-2026-90678 (CVSS 7.5) — An issue was discovered in HAProxy 3.3.0 through 3.4.4 and in 3.5-dev1 through 3.5-dev5. Exploitation requires…
    CVE-2026-26081 (CVSS 4.8) — HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy …
    CVE-2026-26080 (CVSS 3.7) — HAProxy Community Edition 3.2.x through 3.3.x before 3.3.3 can enter a loop or crash because varint is mishand…
    CVE-2026-55204 (CVSS 8.7) — HAProxy through 3.4.0, fixed in commit 9a6d1fe, contains a null pointer dereference vulnerability in hpack_dh…
    CVE-2026-33555 (CVSS 4) — An issue was discovered in HAProxy before 3.3.6. The HTTP/3 parser does not check that the received body lengt…
    CVE-2025-59303 (CVSS 6.4) — HAProxy Kubernetes Ingress Controller before 3.1.13, when the config-snippets feature flag is used, accepts co…
    CVE-2025-11230 (CVSS 7.5) — Inefficient algorithm complexity in mjson in HAProxy allows remote attackers to cause a denial of service via …
    CVE-2025-32464 (CVSS 6.8) — HAProxy 2.2 through 3.1.6, in certain uncommon configurations, has a sample_conv_regsub heap-based buffer over…
    CVE-2024-53008 (CVSS 5.3) — Inconsistent interpretation of HTTP requests ('HTTP Request/Response Smuggling') issue exists in HAProxy. If t…

    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