{
    "id": "CVE-2019-12519",
    "published": "2020-04-15 20:15:13",
    "last_modified": "2026-06-17 02:14:48",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-787",
    "description": "An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.",
    "epss_score": "0.06717",
    "epss_percentile": "0.93737",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-05 18:17:19",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "canonical",
            "product": "ubuntu_linux"
        },
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "opensuse",
            "product": "leap"
        },
        {
            "vendor": "squid-cache",
            "product": "squid"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html",
        "http://www.openwall.com/lists/oss-security/2020/04/23/1",
        "https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt",
        "https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html",
        "https://security.gentoo.org/glsa/202005-05",
        "https://security.netapp.com/advisory/ntap-20210205-0006/",
        "https://usn.ubuntu.com/4356-1/",
        "https://www.debian.org/security/2020/dsa-4682",
        "http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html",
        "http://www.openwall.com/lists/oss-security/2020/04/23/1",
        "https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt",
        "https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html",
        "https://security.gentoo.org/glsa/202005-05",
        "https://security.netapp.com/advisory/ntap-20210205-0006/",
        "https://usn.ubuntu.com/4356-1/",
        "https://www.debian.org/security/2020/dsa-4682"
    ]
}