chore(deps): update dependency lodash to v4.18.1 [security]#15
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Dependency Review✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.OpenSSF ScorecardScorecard details
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| datasource | package | from | to | | ---------- | ------- | ------- | ------ | | npm | lodash | 4.17.23 | 4.18.1 |
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This PR contains the following updates:
4.17.23→4.18.1lodash vulnerable to Prototype Pollution via array path bypass in
_.unsetand_.omitCVE-2026-2950 / GHSA-f23m-r3pf-42rh
More information
Details
Impact
Lodash versions 4.17.23 and earlier are vulnerable to prototype pollution in the
_.unsetand_.omitfunctions. 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 asObject.prototype,Number.prototype, andString.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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:LReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
lodash vulnerable to Code Injection via
_.templateimports key namesCVE-2026-4800 / GHSA-r5fr-rjxr-66jc
More information
Details
Impact
The fix for CVE-2021-23337 added validation for the
variableoption in_.templatebut did not apply the same validation tooptions.importskey names. Both paths flow into the sameFunction()constructor sink.When an application passes untrusted input as
options.importskey names, an attacker can inject default-parameter expressions that execute arbitrary code at template compilation time.Additionally,
_.templateusesassignInWithto merge imports, which enumerates inherited properties viafor..in. IfObject.prototypehas been polluted by any other vector, the polluted keys are copied into the imports object and passed toFunction().Patches
Users should upgrade to version 4.18.0.
The fix applies two changes:
importsKeysagainst the existingreForbiddenIdentifierCharsregex (same check already used for thevariableoption)assignInWithwithassignWithwhen merging imports, so only own properties are enumeratedWorkarounds
Do not pass untrusted input as key names in
options.imports. Only use developer-controlled, static key names.Severity
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
lodash/lodash (lodash)
v4.18.1Compare Source
Bugs
Fixes a
ReferenceErrorissue inlodashlodash-eslodash-amdandlodash.templatewhen using thetemplateandfromPairsfunctions 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-npmlodash-es: lodash/lodash@4.18.0-es...4.18.1-eslodash-amd: lodash/lodash@4.18.0-amd...4.18.1-amdlodash.templatelodash/lodash@4.18.0-npm-packages...4.18.1-npm-packagesv4.18.0Compare Source
v4.18.0
Full Changelog: lodash/lodash@4.17.23...4.18.0
Security
_.unset/_.omit: Fixed prototype pollution viaconstructor/prototypepath 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. Nowconstructorandprototypeare blocked unconditionally as non-terminal path keys, matchingbaseSet. Calls that previously returnedtrueand deleted the property now returnfalseand leave the target untouched._.template: Fixed code injection viaimportskeys (GHSA-r5fr-rjxr-66jc, CVE-2026-4800, 879aaa9). Fixes an incomplete patch for CVE-2021-23337. Thevariableoption was validated againstreForbiddenIdentifierCharsbutimportsKeyswas left unguarded, allowing code injection via the sameFunction()constructor sink.importskeys containing forbidden identifier characters now throw"Invalid imports option passed into _.template".Docs
_.templatein threat model and API docs (#6099)lower > upperbehavior in_.random(#6115)_.compactjsdoc (#6090)lodash.*modular packagesDiff
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: (in timezone America/New_York)
🚦 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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