Update dependency lodash to v4.18.1 [SECURITY]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
lodash (source)	4.17.23 → 4.18.1

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lodash vulnerable to Code Injection via _.template imports key names

CVE-2026-4800 / GHSA-r5fr-rjxr-66jc

More information

Details

Impact

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. 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.

The fix applies two changes:

1. Validate importsKeys against the existing reForbiddenIdentifierChars regex (same check already used for the variable option)
2. Replace assignInWith with assignWith when merging imports, so only own properties are enumerated

Workarounds

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

Severity

• CVSS Score: 8.1 / 10 (High)
• Vector String: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References

• https://github.com/lodash/lodash/security/advisories/GHSA-r5fr-rjxr-66jc
• https://nvd.nist.gov/vuln/detail/CVE-2026-4800
• https://github.com/lodash/lodash/commit/3469357cff396a26c363f8c1b5a91dde28ba4b1c
• https://cna.openjsf.org/security-advisories.html
• https://github.com/advisories/GHSA-35jh-r3h4-6jhm
• https://github.com/advisories/GHSA-r5fr-rjxr-66jc

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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lodash vulnerable to Prototype Pollution via array path bypass in _.unset and _.omit

CVE-2026-2950 / GHSA-f23m-r3pf-42rh

More information

Details

Impact

Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the _.unset and _.omit functions. The fix for CVE-2025-13465 only guards against string key members, so an attacker can bypass the check by passing array-wrapped path segments. This allows deletion of properties from built-in prototypes such as Object.prototype, Number.prototype, and String.prototype.

The issue permits deletion of prototype properties but does not allow overwriting their original behavior.

Patches

This issue is patched in 4.18.0.

Workarounds

None. Upgrade to the patched version.

Severity

• CVSS Score: 6.5 / 10 (Medium)
• Vector String: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

References

• https://github.com/lodash/lodash/security/advisories/GHSA-f23m-r3pf-42rh
• https://github.com/lodash/lodash/security/advisories/GHSA-xxjr-mmjv-4gpg
• https://nvd.nist.gov/vuln/detail/CVE-2026-2950
• https://github.com/advisories/GHSA-f23m-r3pf-42rh

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

lodash/lodash (lodash)

v4.18.1

Compare Source

v4.18.0

Compare Source

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