CVE-2026-4800

The fix for CVE-2021-23337 added validation for the variable option in _.template but did not apply the same validation to options.imports key names, and both paths flow into the same Function() constructor sink. When an application passes untrusted input as options.imports key names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time. Additionally, _.template uses assignInWith to merge imports, which enumerates inherited properties via for..in, so if Object.prototype has been polluted by another vector the polluted keys are copied into the imports object and passed to Function(). The issue is fixed in 4.18.1 for lodash, lodash-es, lodash-amd, and lodash.template. As a workaround, do not pass untrusted input as key names in options.imports; use only developer-controlled, static key names.

Database specific

{
    "cna_assigner":  "openjs",
    "cwe_ids":  [
        "CWE-94"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4800.json"
}

References

Affected packages

Git / github.com/lodash/lodash

Affected ranges

Type

GIT

Repo

https://github.com/lodash/lodash

Events

Introduced

d35a9c40beb594d09814ba7f7673b81d4d67a816

Fixed

5857260e49359f36999a537cb9c380861e36a61c

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "4.0.0"
        },
        {
            "fixed":  "4.18.1"
        },
        {
            "cpe":  "cpe:2.3:a:lodash:lodash:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.18.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:lodash:lodash-amd:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.18.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "cpe":  "cpe:2.3:a:lodash:lodash-es:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "4.0.0"
                },
                {
                    "fixed":  "4.18.0"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

4.*

4.0.0-npm-packages

4.0.1-npm-packages

4.0.2-npm-packages

4.0.3-npm-packages

4.0.4-npm-packages

4.0.5-npm-packages

4.0.6-npm-packages

4.0.7-npm-packages

4.0.8-npm-packages

4.0.9-npm-packages

4.1.0-npm-packages

4.1.1-npm-packages

4.1.2-npm-packages

4.1.3-npm-packages

4.1.4-npm-packages

4.1.5-npm-packages

4.10.0-npm-packages

4.10.1-npm-packages

4.10.2-npm-packages

4.11.0-npm-packages

4.11.1-npm-packages

4.11.2-npm-packages

4.12.0-npm-packages

4.12.1-npm-packages

4.13.0-npm-packages

4.14.0-npm-packages

4.15.0-npm-packages

4.18.0-npm-packages

4.2.0-npm-packages

4.2.1-npm-packages

4.2.2-npm-packages

4.2.3-npm-packages

4.2.4-npm-packages

4.2.5-npm-packages

4.3.0-npm-packages

4.3.1-npm-packages

4.3.2-npm-packages

4.3.3-npm-packages

4.3.4-npm-packages

4.3.5-npm-packages

4.4.0-npm-packages

4.4.1-npm-packages

4.4.2-npm-packages

4.4.3-npm-packages

4.5.0-npm-packages

4.5.1-npm-packages

4.5.2-npm-packages

4.5.3-npm-packages

4.5.4-npm-packages

4.5.5-npm-packages

4.5.6-npm-packages

4.5.7-npm-packages

4.6.0-npm-packages

4.6.1-npm-packages

4.6.2-npm-packages

4.7.0-npm-packages

4.7.1-npm-packages

4.8.0-npm-packages

4.8.1-npm-packages

4.9.0-npm-packages

4.9.1-npm-packages

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4800.json"