{
    "id": "CVE-2013-0156",
    "published": "2013-01-13 22:55:00",
    "last_modified": "2026-06-16 23:48:52",
    "cvss_score": "7.5",
    "cvss_severity": "HIGH",
    "cvss_version": "2.0",
    "cvss_vector": "AV:N/AC:L/Au:N/C:P/I:P/A:P",
    "cwe": "CWE-20",
    "description": "active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before 3.0.19, 3.1.x before 3.1.10, and 3.2.x before 3.2.11 does not properly restrict casts of string values, which allows remote attackers to conduct object-injection attacks and execute arbitrary code, or cause a denial of service (memory and CPU consumption) involving nested XML entity references, by leveraging Action Pack support for (1) YAML type conversion or (2) Symbol type conversion.",
    "epss_score": "0.99449",
    "epss_percentile": "0.99942",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:18:43",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "debian",
            "product": "debian_linux"
        },
        {
            "vendor": "rubyonrails",
            "product": "rails"
        },
        {
            "vendor": "rubyonrails",
            "product": "ruby_on_rails"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "27527",
            "title": "Ruby on Rails - Known Secret Session Cookie Remote Code Execution (Metasploit)",
            "date": "2013-08-12",
            "url": "https://www.exploit-db.com/exploits/27527"
        },
        {
            "source": "exploit-db",
            "ref_id": "24019",
            "title": "Ruby on Rails - XML Processor YAML Deserialization Code Execution (Metasploit)",
            "date": "2013-01-10",
            "url": "https://www.exploit-db.com/exploits/24019"
        }
    ],
    "refs_list": [
        "http://ics-cert.us-cert.gov/advisories/ICSA-13-036-01A",
        "http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0153.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0154.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0155.html",
        "http://weblog.rubyonrails.org/2013/1/28/Rails-3-0-20-and-2-3-16-have-been-released/",
        "http://www.debian.org/security/2013/dsa-2604",
        "http://www.fujitsu.com/global/support/software/security/products-f/sw-sv-rcve-ror201301e.html",
        "http://www.insinuator.net/2013/01/rails-yaml/",
        "http://www.kb.cert.org/vuls/id/380039",
        "http://www.kb.cert.org/vuls/id/628463",
        "https://community.rapid7.com/community/metasploit/blog/2013/01/09/serialization-mischief-in-ruby-land-cve-2013-0156",
        "https://groups.google.com/group/rubyonrails-security/msg/c1432d0f8c70e89d?dmode=source&output=gplain",
        "https://puppet.com/security/cve/cve-2013-0156",
        "http://ics-cert.us-cert.gov/advisories/ICSA-13-036-01A",
        "http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0153.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0154.html",
        "http://rhn.redhat.com/errata/RHSA-2013-0155.html",
        "http://weblog.rubyonrails.org/2013/1/28/Rails-3-0-20-and-2-3-16-have-been-released/",
        "http://www.debian.org/security/2013/dsa-2604",
        "http://www.fujitsu.com/global/support/software/security/products-f/sw-sv-rcve-ror201301e.html",
        "http://www.insinuator.net/2013/01/rails-yaml/",
        "http://www.kb.cert.org/vuls/id/380039",
        "http://www.kb.cert.org/vuls/id/628463"
    ]
}