{
    "id": "CVE-2018-1000005",
    "published": "2018-01-24 22:29:00",
    "last_modified": "2026-06-17 01:32:11",
    "cvss_score": "9.1",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.0",
    "cvss_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
    "cwe": "CWE-125",
    "description": "libcurl 7.49.0 to and including 7.57.0 contains an out bounds read in code handling HTTP/2 trailers. It was reported (https://github.com/curl/curl/pull/2231) that reading an HTTP/2 trailer could mess up future trailers since the stored size was one byte less than required. The problem is that the code that creates HTTP/1-like headers from the HTTP/2 trailer data once appended a string like `:` to the target buffer, while this was recently changed to `: ` (a space was added after the colon) but the following math wasn't updated correspondingly. When accessed, the data is read out of bounds and causes either a crash or that the (too large) data gets passed to client write. This could lead to a denial-of-service situation or an information disclosure if someone has a service that echoes back or uses the trailers for something.",
    "epss_score": "0.04556",
    "epss_percentile": "0.91343",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-07 18:17:17",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.1), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "haxx",
            "product": "libcurl"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://www.securitytracker.com/id/1040273",
        "https://access.redhat.com/errata/RHSA-2019:1543",
        "https://curl.haxx.se/docs/adv_2018-824a.html",
        "https://github.com/curl/curl/pull/2231",
        "https://usn.ubuntu.com/3554-1/",
        "https://www.debian.org/security/2018/dsa-4098",
        "http://www.securitytracker.com/id/1040273",
        "https://access.redhat.com/errata/RHSA-2019:1543",
        "https://curl.haxx.se/docs/adv_2018-824a.html",
        "https://github.com/curl/curl/pull/2231",
        "https://usn.ubuntu.com/3554-1/",
        "https://www.debian.org/security/2018/dsa-4098"
    ]
}