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chore(deps): update dependency lodash-es to v4.18.1 [security]#13585

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renovate/npm-lodash-es-vulnerability
Apr 2, 2026
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chore(deps): update dependency lodash-es to v4.18.1 [security]#13585
chenjiahan merged 1 commit intomainfrom
renovate/npm-lodash-es-vulnerability

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@renovate renovate Bot commented Apr 2, 2026

This PR contains the following updates:

Package Change Age Adoption Passing Confidence
lodash-es (source) 4.17.234.18.1 age adoption passing confidence

Warning

Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

GitHub Vulnerability Alerts

CVE-2026-2950

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.

CVE-2026-4800

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.


Release Notes

lodash/lodash (lodash-es)

v4.18.1

Compare Source

Bugs

Fixes a ReferenceError issue in lodash lodash-es lodash-amd and lodash.template when using the template and fromPairs functions from the modular builds. See #​6167 (comment)

These defects were related to how lodash distributions are built from the main branch using https://github.com/lodash-archive/lodash-cli. When internal dependencies change inside lodash functions, equivalent updates need to be made to a mapping in the lodash-cli. (hey, it was ahead of its time once upon a time!). We know this, but we missed it in the last release. It's the kind of thing that passes in CI, but fails bc the build is not the same thing you tested.

There is no diff on main for this, but you can see the diffs for each of the npm packages on their respective branches:

lodash: lodash/lodash@4.18.0-npm...4.18.1-npm
lodash-es: lodash/lodash@4.18.0-es...4.18.1-es
lodash-amd: lodash/lodash@4.18.0-amd...4.18.1-amd
lodash.templatelodash/lodash@4.18.0-npm-packages...4.18.1-npm-packages

v4.18.0

Compare Source

v4.18.0

Full Changelog: lodash/lodash@4.17.23...4.18.0

Security

_.unset / _.omit: Fixed prototype pollution via constructor/prototype path traversal (GHSA-f23m-r3pf-42rh, fe8d32e). Previously, array-wrapped path segments and primitive roots could bypass the existing guards, allowing deletion of properties from built-in prototypes. Now constructor and prototype are blocked unconditionally as non-terminal path keys, matching baseSet. Calls that previously returned true and deleted the property now return false and leave the target untouched.

_.template: Fixed code injection via imports keys (GHSA-r5fr-rjxr-66jc, CVE-2026-4800, 879aaa9). Fixes an incomplete patch for CVE-2021-23337. The variable option was validated against reForbiddenIdentifierChars but importsKeys was left unguarded, allowing code injection via the same Function() constructor sink. imports keys containing forbidden identifier characters now throw "Invalid imports option passed into _.template".

Docs
  • Add security notice for _.template in threat model and API docs (#​6099)
  • Document lower > upper behavior in _.random (#​6115)
  • Fix quotes in _.compact jsdoc (#​6090)
lodash.* modular packages

Diff

We have also regenerated and published a select number of the lodash.* modular packages.

These modular packages had fallen out of sync significantly from the minor/patch updates to lodash. Specifically, we have brought the following packages up to parity w/ the latest lodash release because they have had CVEs on them in the past:


Configuration

📅 Schedule: Branch creation - "" in timezone Asia/Shanghai, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.


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This PR was generated by Mend Renovate. View the repository job log.

@renovate renovate Bot added the dependencies Pull requests that update a dependency file label Apr 2, 2026
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github-actions Bot commented Apr 2, 2026

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 0 projects with changes.

📊 Quick Summary
Project Total Size Change
react-10k 5.7 MB 0
react-1k 826.3 KB 0
react-5k 2.7 MB 0
ui-components 2.3 MB 0
rome 984.2 KB 0

Generated by Rsdoctor GitHub Action

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codspeed-hq Bot commented Apr 2, 2026

Merging this PR will degrade performance by 2.43%

🎉 Hooray! codspeed-rust just leveled up to 4.4.1!

A heads-up, this is a breaking change and it might affect your current performance baseline a bit. But here's the exciting part - it's packed with new, cool features and promises improved result stability 🥳!
Curious about what's new? Visit our releases page to delve into all the awesome details about this new version.

❌ 1 regressed benchmark
✅ 15 untouched benchmarks
⏩ 19 skipped benchmarks1

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

Mode Benchmark BASE HEAD Efficiency
Simulation rust@create_chunk_ids 10.5 ms 10.7 ms -2.43%

Comparing renovate/npm-lodash-es-vulnerability (b91eae0) with main (173af38)

Open in CodSpeed

Footnotes

  1. 19 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports.

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github-actions Bot commented Apr 2, 2026

📦 Binary Size-limit

Comparing b91eae0 to chore: run @rspack/cli, @rspack/tests tests sequentially in wasm (#13557) by CPunisher

🎉 Size decreased by 7.97KB from 49.09MB to 49.08MB (⬇️0.02%)

@chenjiahan chenjiahan enabled auto-merge (squash) April 2, 2026 07:25
@chenjiahan chenjiahan merged commit 543190e into main Apr 2, 2026
38 checks passed
@chenjiahan chenjiahan deleted the renovate/npm-lodash-es-vulnerability branch April 2, 2026 07:27
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