CVE-2026-4800 — lodash vulnerable to Code Injection via `_.template` imports key names

Affected: lodash, lodash-es, lodash-amd, lodash.template, Red Hat Cryostat 4 on RHEL 9, Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 9, Red Hat Data Grid 8.6.1, Red Hat Enterprise Linux 10 and 98 more

Impact:

The fix for CVE-2021-23337 (https://github.com/advisories/GHSA-35jh-r3h4-6jhm) added validation for the variable option in _.template but did not apply the same validation to options.imports key names. 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. If Object.prototype has been polluted by any other vector, the polluted keys are copied into the imports object and passed to Function().

Patches:

Users should upgrade to version 4.18.0.

Workarounds:

Do not pass untrusted input as key names in options.imports. Only use developer-controlled, static key names.

USN-8411-1 — node-lodash vulnerabilities

Affected: Ubuntu:Pro:16.04:LTS: node-lodash, Ubuntu:Pro:18.04:LTS: node-lodash, Ubuntu:Pro:20.04:LTS: node-lodash, Ubuntu:Pro:22.04:LTS: node-lodash, Ubuntu:Pro:24.04:LTS: node-lodash, Ubuntu:25.10: node-lodash, Ubuntu:Pro:26.04:LTS: node-lodash

It was discovered that Lodash was vulnerable to a prototype pollution issue in the zipObjectDeep function. An attacker could possibly use this issue to modify application behavior. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-8203)

Liyuan Chen discovered that Lodash was vulnerable to a regular expression denial of service issue in the toNumber, trim, and trimEnd functions. An attacker could possibly use this issue to consume excessive system resources, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-28500)

Marc Hassan discovered that Lodash did not properly sanitize input to the template function. An attacker could possibly use this issue to inject and execute arbitrary commands. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS. (CVE-2021-23337)

It was discovered that Lodash was vulnerable to a prototype pollution issue in the unset and omit functions. An attacker could possibly use this issue to delete properties from global prototypes, resulting in security restrictions being bypassed. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 25.10. (CVE-2025-13465)

It was discovered that Lodash was vulnerable to a prototype pollution issue in the unset and omit functions. An attacker could possibly use this issue to delete properties from built-in prototypes, resulting in security restrictions being…

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CVE-2026-4800 — lodash vulnerable to Code Injection via `_.template` imports key names

USN-8411-1 — node-lodash vulnerabilities