{
    "id": "CVE-2009-4018",
    "published": "2009-11-29 13:07:32",
    "last_modified": "2026-06-16 23:12:50",
    "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-264",
    "description": "The proc_open function in ext/standard/proc_open.c in PHP before 5.2.11 and 5.3.x before 5.3.1 does not enforce the (1) safe_mode_allowed_env_vars and (2) safe_mode_protected_env_vars directives, which allows context-dependent attackers to execute programs with an arbitrary environment via the env parameter, as demonstrated by a crafted value of the LD_LIBRARY_PATH environment variable.",
    "epss_score": "0.11341",
    "epss_percentile": "0.95869",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-10-03 18:17:09",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "php",
            "product": "php"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "11636",
            "title": "Kolang 4.3.10 < 5.3.0 - 'proc_open()' PHP 'safe_mode' Bypass",
            "date": "2010-03-05",
            "url": "https://www.exploit-db.com/exploits/11636"
        }
    ],
    "refs_list": [
        "http://bugs.php.net/bug.php?id=49026",
        "http://marc.info/?l=bugtraq&m=127680701405735&w=2",
        "http://marc.info/?l=oss-security&m=125886770008678&w=2",
        "http://marc.info/?l=oss-security&m=125897935330618&w=2",
        "http://secunia.com/advisories/40262",
        "http://secunia.com/advisories/41480",
        "http://secunia.com/advisories/41490",
        "http://svn.php.net/viewvc/?view=revision&revision=286360",
        "http://svn.php.net/viewvc/php/php-src/branches/PHP_5_2/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360",
        "http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360",
        "http://www.itrc.hp.com/service/cki/docDisplay.do?docId=emr_na-c02512995",
        "http://www.mandriva.com/security/advisories?name=MDVSA-2009:303",
        "http://www.openwall.com/lists/oss-security/2009/11/23/15",
        "http://www.php.net/ChangeLog-5.php",
        "http://www.securityfocus.com/bid/37138",
        "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7256",
        "http://bugs.php.net/bug.php?id=49026",
        "http://marc.info/?l=bugtraq&m=127680701405735&w=2",
        "http://marc.info/?l=oss-security&m=125886770008678&w=2",
        "http://marc.info/?l=oss-security&m=125897935330618&w=2",
        "http://secunia.com/advisories/40262",
        "http://secunia.com/advisories/41480",
        "http://secunia.com/advisories/41490",
        "http://svn.php.net/viewvc/?view=revision&revision=286360",
        "http://svn.php.net/viewvc/php/php-src/branches/PHP_5_2/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360"
    ]
}