Common Weakness Enumeration

CWE-94

Allowed-with-Review

Improper Control of Generation of Code ('Code Injection')

Abstraction: Base · Status: Draft

The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

8420 vulnerabilities reference this CWE, most recent first.

GHSA-HFFM-XVC3-VPRC

Vulnerability from github – Published: 2026-04-25 06:30 – Updated: 2026-05-05 20:12
VLAI
Summary
simple-git is vulnerable to Remote Code Execution
Details

Versions of the package simple-git before 3.36.0 are vulnerable to Remote Code Execution (RCE) due to an incomplete fix for CVE-2022-25912 that blocks the -c option but not the equivalent --config form. If untrusted input can reach the options argument passed to simple-git, an attacker may still achieve remote code execution by enabling protocol.ext.allow=always and using an ext:: clone source.

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "simple-git"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.36.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-6951"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-05T20:12:16Z",
    "nvd_published_at": "2026-04-25T06:16:16Z",
    "severity": "HIGH"
  },
  "details": "Versions of the package simple-git before 3.36.0 are vulnerable to Remote Code Execution (RCE) due to an incomplete fix for [CVE-2022-25912](https://security.snyk.io/vuln/SNYK-JS-SIMPLEGIT-3112221) that blocks the -c option but not the equivalent --config form. If untrusted input can reach the options argument passed to simple-git, an attacker may still achieve remote code execution by enabling protocol.ext.allow=always and using an ext:: clone source.",
  "id": "GHSA-hffm-xvc3-vprc",
  "modified": "2026-05-05T20:12:16Z",
  "published": "2026-04-25T06:30:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6951"
    },
    {
      "type": "WEB",
      "url": "https://github.com/steveukx/git-js/commit/89a2294febed5dfe737c4c735d936bb6018746a8"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/KKC73/02d1d97f3410756095b501fda0ac8ca6"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/steveukx/git-js"
    },
    {
      "type": "WEB",
      "url": "https://security.snyk.io/vuln/SNYK-JS-SIMPLEGIT-15456078"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "simple-git is vulnerable to Remote Code Execution"
}

GHSA-HFJ3-56HH-M6HM

Vulnerability from github – Published: 2022-05-17 00:38 – Updated: 2022-05-17 00:38
VLAI
Details

Static code injection vulnerability in admin/install.php in Flexcustomer 0.0.6 might allow remote attackers to inject arbitrary PHP code into const.inc.php via the installdbname parameter (aka the Database Name field). NOTE: the installation instructions specify deleting admin/install.php.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2008-6761"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2009-04-28T16:30:00Z",
    "severity": "HIGH"
  },
  "details": "Static code injection vulnerability in admin/install.php in Flexcustomer 0.0.6 might allow remote attackers to inject arbitrary PHP code into const.inc.php via the installdbname parameter (aka the Database Name field).  NOTE: the installation instructions specify deleting admin/install.php.",
  "id": "GHSA-hfj3-56hh-m6hm",
  "modified": "2022-05-17T00:38:22Z",
  "published": "2022-05-17T00:38:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2008-6761"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/47652"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/7622"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-HFJ4-QHJG-Q72C

Vulnerability from github – Published: 2025-03-14 18:30 – Updated: 2025-11-07 03:30
VLAI
Details

The Automation Scripting functionality can be exploited by attackers to run arbitrary system commands on the underlying operating system. An account with administrator privileges or that has been explicitly granted access to use Automation Scripting is needed to carry out the attack. Exploitation of this vulnerability would allow an attacker to run commands of their choosing on the underlying operating system of the web server running LogicalDOC.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-54448"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-03-14T18:15:30Z",
    "severity": "HIGH"
  },
  "details": "The Automation Scripting functionality can be exploited by attackers to run arbitrary system commands on the underlying operating system. An account with administrator privileges or that has been explicitly granted access to use Automation Scripting is needed to carry out the attack.\u00a0Exploitation of this vulnerability would allow an attacker to run commands of their choosing on the underlying operating system of the web server running LogicalDOC.",
  "id": "GHSA-hfj4-qhjg-q72c",
  "modified": "2025-11-07T03:30:24Z",
  "published": "2025-03-14T18:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-54448"
    },
    {
      "type": "WEB",
      "url": "https://www.blackduck.com/blog/cyrc-advisory-logicaldoc.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

GHSA-HFMQ-RGX6-C6F4

Vulnerability from github – Published: 2022-05-01 18:30 – Updated: 2025-01-17 15:32
VLAI
Details

** DISPUTED ** PHP remote file inclusion vulnerability in lib/classes/offl_nflteam.php in Online Fantasy Football League (OFFL) 0.2.6 allows remote attackers to execute arbitrary PHP code via a URL in the DOC_ROOT parameter. NOTE: this issue is disputed by CVE because a FILE test protects offl_nflteam.php against direct requests.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2007-5097"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2007-09-26T22:17:00Z",
    "severity": "HIGH"
  },
  "details": "** DISPUTED **  PHP remote file inclusion vulnerability in lib/classes/offl_nflteam.php in Online Fantasy Football League (OFFL) 0.2.6 allows remote attackers to execute arbitrary PHP code via a URL in the DOC_ROOT parameter.  NOTE: this issue is disputed by CVE because a __FILE__ test protects offl_nflteam.php against direct requests.",
  "id": "GHSA-hfmq-rgx6-c6f4",
  "modified": "2025-01-17T15:32:30Z",
  "published": "2022-05-01T18:30:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2007-5097"
    },
    {
      "type": "WEB",
      "url": "http://arfis.wordpress.com/2007/09/14/rfi-02-online-fantasy-football-league"
    },
    {
      "type": "WEB",
      "url": "http://osvdb.org/38722"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-HFQ3-Q7C4-8R8R

Vulnerability from github – Published: 2022-05-02 06:20 – Updated: 2022-05-02 06:20
VLAI
Details

The IE8 Developer Toolbar in Microsoft Internet Explorer 8 SP1, SP2, and SP3 allows user-assisted remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka "Uninitialized Memory Corruption Vulnerability."

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2010-1261"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2010-06-08T22:30:00Z",
    "severity": "HIGH"
  },
  "details": "The IE8 Developer Toolbar in Microsoft Internet Explorer 8 SP1, SP2, and SP3 allows user-assisted remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, leading to memory corruption, aka \"Uninitialized Memory Corruption Vulnerability.\"",
  "id": "GHSA-hfq3-q7c4-8r8r",
  "modified": "2022-05-02T06:20:45Z",
  "published": "2022-05-02T06:20:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2010-1261"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-035"
    },
    {
      "type": "WEB",
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7124"
    },
    {
      "type": "WEB",
      "url": "http://osvdb.org/65214"
    },
    {
      "type": "WEB",
      "url": "http://support.avaya.com/css/P8/documents/100089747"
    },
    {
      "type": "WEB",
      "url": "http://www.us-cert.gov/cas/techalerts/TA10-159B.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-HFR2-MW2V-5FH3

Vulnerability from github – Published: 2025-06-23 15:31 – Updated: 2025-06-23 15:31
VLAI
Details

On a client with a non-admin user, a script can be integrated into a report. The reports could later be executed on the BRAIN2 server with administrator rights.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-6512"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-23T13:15:22Z",
    "severity": "CRITICAL"
  },
  "details": "On a client with a non-admin user, a script can be integrated into a report. The reports could later be executed on the BRAIN2 server with administrator rights.",
  "id": "GHSA-hfr2-mw2v-5fh3",
  "modified": "2025-06-23T15:31:41Z",
  "published": "2025-06-23T15:31:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-6512"
    },
    {
      "type": "WEB",
      "url": "https://www.bizerba.com/downloads/global/information-security/2025/bizerba-sa-2025-0004.pdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-HG32-P8HW-8G3X

Vulnerability from github – Published: 2022-04-29 02:57 – Updated: 2024-02-08 03:32
VLAI
Details

PHP remote file inclusion vulnerabilities in include/footer.inc.php in (1) AllMyVisitors, (2) AllMyLinks, and (3) AllMyGuests allow remote attackers to execute arbitrary PHP code via a URL in the _AMVconfig[cfg_serverpath] parameter.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2004-0285"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-829",
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2004-11-23T05:00:00Z",
    "severity": "HIGH"
  },
  "details": "PHP remote file inclusion vulnerabilities in include/footer.inc.php in (1) AllMyVisitors, (2) AllMyLinks, and (3) AllMyGuests allow remote attackers to execute arbitrary PHP code via a URL in the _AMVconfig[cfg_serverpath] parameter.",
  "id": "GHSA-hg32-p8hw-8g3x",
  "modified": "2024-02-08T03:32:43Z",
  "published": "2022-04-29T02:57:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2004-0285"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/15226"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/15227"
    },
    {
      "type": "WEB",
      "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/15228"
    },
    {
      "type": "WEB",
      "url": "http://marc.info/?l=bugtraq\u0026m=107696209514155\u0026w=2"
    },
    {
      "type": "WEB",
      "url": "http://marc.info/?l=bugtraq\u0026m=107696235424865\u0026w=2"
    },
    {
      "type": "WEB",
      "url": "http://marc.info/?l=bugtraq\u0026m=107696291728750\u0026w=2"
    },
    {
      "type": "WEB",
      "url": "http://www.osvdb.org/6721"
    },
    {
      "type": "WEB",
      "url": "http://www.securityfocus.com/bid/9664"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-HG4Q-XF5C-5JVV

Vulnerability from github – Published: 2022-05-14 02:34 – Updated: 2022-05-14 02:34
VLAI
Details

Microsoft Internet Explorer 9 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability," a different vulnerability than CVE-2013-3150.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2013-3145"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2013-07-10T03:46:00Z",
    "severity": "HIGH"
  },
  "details": "Microsoft Internet Explorer 9 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka \"Internet Explorer Memory Corruption Vulnerability,\" a different vulnerability than CVE-2013-3150.",
  "id": "GHSA-hg4q-xf5c-5jvv",
  "modified": "2022-05-14T02:34:17Z",
  "published": "2022-05-14T02:34:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-3145"
    },
    {
      "type": "WEB",
      "url": "https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-055"
    },
    {
      "type": "WEB",
      "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16872"
    },
    {
      "type": "WEB",
      "url": "http://www.us-cert.gov/ncas/alerts/TA13-190A"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GHSA-HG4W-45RW-R7W7

Vulnerability from github – Published: 2022-05-14 01:42 – Updated: 2022-05-14 01:42
VLAI
Details

The yaml_parse.load method in Pylearn2 allows code injection.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-20027"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2018-12-17T15:29:00Z",
    "severity": "CRITICAL"
  },
  "details": "The yaml_parse.load method in Pylearn2 allows code injection.",
  "id": "GHSA-hg4w-45rw-r7w7",
  "modified": "2022-05-14T01:42:49Z",
  "published": "2022-05-14T01:42:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-20027"
    },
    {
      "type": "WEB",
      "url": "https://github.com/lisa-lab/pylearn2/issues/1593"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-HG8F-GHPP-QPMQ

Vulnerability from github – Published: 2024-07-10 21:30 – Updated: 2024-08-08 15:31
VLAI
Details

An issue was discovered on Renesas SmartBond DA14691, DA14695, DA14697, and DA14699 devices. The Nonce used for on-the-fly decryption of flash images is stored in an unsigned header, allowing its value to be modified without invalidating the signature used for secureboot image verification. Because the encryption engine for on-the-fly decryption uses AES in CTR mode without authentication, an attacker-modified Nonce can result in execution of arbitrary code.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-25077"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-94"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-10T20:15:03Z",
    "severity": "CRITICAL"
  },
  "details": "An issue was discovered on Renesas SmartBond DA14691, DA14695, DA14697, and DA14699 devices. The Nonce used for on-the-fly decryption of flash images is stored in an unsigned header, allowing its value to be modified without invalidating the signature used for secureboot image verification. Because the encryption engine for on-the-fly decryption uses AES in CTR mode without authentication, an attacker-modified Nonce can result in execution of arbitrary code.",
  "id": "GHSA-hg8f-ghpp-qpmq",
  "modified": "2024-08-08T15:31:27Z",
  "published": "2024-07-10T21:30:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-25077"
    },
    {
      "type": "WEB",
      "url": "https://github.com/atredispartners/advisories/blob/master/ATREDIS-2024-0001.md"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

Mitigation
Architecture and Design

Strategy: Refactoring

Refactor your program so that you do not have to dynamically generate code.

Mitigation
Architecture and Design
  • Run your code in a "jail" or similar sandbox environment that enforces strict boundaries between the process and the operating system. This may effectively restrict which code can be executed by your product.
  • Examples include the Unix chroot jail and AppArmor. In general, managed code may provide some protection.
  • This may not be a feasible solution, and it only limits the impact to the operating system; the rest of your application may still be subject to compromise.
  • Be careful to avoid CWE-243 and other weaknesses related to jails.
Mitigation MIT-5
Implementation

Strategy: Input Validation

  • Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
  • When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, "boat" may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as "red" or "blue."
  • Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code's environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
  • To reduce the likelihood of code injection, use stringent allowlists that limit which constructs are allowed. If you are dynamically constructing code that invokes a function, then verifying that the input is alphanumeric might be insufficient. An attacker might still be able to reference a dangerous function that you did not intend to allow, such as system(), exec(), or exit().
Mitigation
Testing

Use dynamic tools and techniques that interact with the product using large test suites with many diverse inputs, such as fuzz testing (fuzzing), robustness testing, and fault injection. The product's operation may slow down, but it should not become unstable, crash, or generate incorrect results.

Mitigation MIT-32
Operation

Strategy: Compilation or Build Hardening

Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).

Mitigation MIT-32
Operation

Strategy: Environment Hardening

Run the code in an environment that performs automatic taint propagation and prevents any command execution that uses tainted variables, such as Perl's "-T" switch. This will force the program to perform validation steps that remove the taint, although you must be careful to correctly validate your inputs so that you do not accidentally mark dangerous inputs as untainted (see CWE-183 and CWE-184).

Mitigation
Implementation

For Python programs, it is frequently encouraged to use the ast.literal_eval() function instead of eval, since it is intentionally designed to avoid executing code. However, an adversary could still cause excessive memory or stack consumption via deeply nested structures [REF-1372], so the python documentation discourages use of ast.literal_eval() on untrusted data [REF-1373].

CAPEC-242: Code Injection

An adversary exploits a weakness in input validation on the target to inject new code into that which is currently executing. This differs from code inclusion in that code inclusion involves the addition or replacement of a reference to a code file, which is subsequently loaded by the target and used as part of the code of some application.

CAPEC-35: Leverage Executable Code in Non-Executable Files

An attack of this type exploits a system's trust in configuration and resource files. When the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.

CAPEC-77: Manipulating User-Controlled Variables

This attack targets user controlled variables (DEBUG=1, PHP Globals, and So Forth). An adversary can override variables leveraging user-supplied, untrusted query variables directly used on the application server without any data sanitization. In extreme cases, the adversary can change variables controlling the business logic of the application. For instance, in languages like PHP, a number of poorly set default configurations may allow the user to override variables.