HAProxy 2.9.x before 2.9.10, 3.0.x before 3.0.4, and 3.1.x through 3.1-dev6 allows a remote denial of service for HTTP/2 zero-copy forwarding (h2_send loop) under a certain set of conditions, as exploited in the wild in 2024.
{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "2.0.33-0ubuntu0.1"
        },
        {
            "binary_name": "haproxy-dbgsym",
            "binary_version": "2.0.33-0ubuntu0.1"
        },
        {
            "binary_name": "haproxy-doc",
            "binary_version": "2.0.33-0ubuntu0.1"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "2.0.33-0ubuntu0.1"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "2.4.24-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "haproxy-dbgsym",
            "binary_version": "2.4.24-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "haproxy-doc",
            "binary_version": "2.4.24-0ubuntu0.22.04.1"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "2.4.24-0ubuntu0.22.04.1"
        }
    ]
}
          {
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "haproxy",
            "binary_version": "2.8.5-1ubuntu3"
        },
        {
            "binary_name": "haproxy-dbgsym",
            "binary_version": "2.8.5-1ubuntu3"
        },
        {
            "binary_name": "haproxy-doc",
            "binary_version": "2.8.5-1ubuntu3"
        },
        {
            "binary_name": "vim-haproxy",
            "binary_version": "2.8.5-1ubuntu3"
        }
    ]
}