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    CVE-2026-110353

    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.

    Published:Oct 22, 2026
    Last Modified:Oct 22, 2026
    EPS:Oct 22, 2026
    EPSS Score:0.00684
    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-2026-110354 (CVSS 7.5) — HAProxy 3 before 3.4.6 allows a remote unauthenticated attacker to cause a denial of service (persistent worke…
    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