p PatchFirst

CVE-2026-4800

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

This page contains facts from public vulnerability sources. Check the original advisory before updating.

This page shows selected source facts. See the linked advisories for the complete description and affected versions.

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.

CVSS 8.1 · High · EPSS 2.8% · Fix available

Published
Updated

Stack: system · node

Affected products and versions

  • lodash

    Versions
    • ≥ 4.0.0, < 4.18.1: Affected (semver)
    • 4.18.1: Not affected (semver)

    Update to 4.18.1

  • lodash-es

    Versions
    • ≥ 4.0.0, < 4.18.1: Affected (semver)
    • 4.18.1: Not affected (semver)

    Update to 4.18.1

  • lodash-amd

    Versions
    • ≥ 4.0.0, < 4.18.1: Affected (semver)
    • 4.18.1: Not affected (semver)

    Update to 4.18.1

  • lodash.template

    Versions
    • ≥ 4.0.0, < 4.18.1: Affected (semver)
    • 4.18.1: Not affected (semver)

    Update to 4.18.1

  • node-lodash Debian:12

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    Affected ranges
    • ECOSYSTEM: < 4.17.21+dfsg+~cs8.31.198.20210220-9+deb12u1

    Update to 4.17.21+dfsg+~cs8.31.198.20210220-9+deb12u1

  • node-lodash Debian:13

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    Affected ranges
    • ECOSYSTEM: < 4.17.21+dfsg+~cs8.31.198.20210220-9+deb13u1

    Update to 4.17.21+dfsg+~cs8.31.198.20210220-9+deb13u1

  • node-lodash Debian:14

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-10
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    • 4.17.23+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 4.18.1+dfsg-1

    Update to 4.18.1+dfsg-1

  • lodash npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.18.0

    Update to 4.18.0

  • lodash-es npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.18.0

    Update to 4.18.0

  • lodash-amd npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.18.0

    Update to 4.18.0

  • lodash.template npm

    Affected ranges
    • SEMVER: ≥ 4.0.0, < 4.18.0

    Update to 4.18.0

  • node-lodash Ubuntu:Pro:16.04:LTS

    Versions
    • 2.4.1+dfsg-3
    Affected ranges
    • ECOSYSTEM: < 2.4.1+dfsg-3ubuntu0.1~esm1

    Update to 2.4.1+dfsg-3ubuntu0.1~esm1

  • node-lodash Ubuntu:Pro:18.04:LTS

    Versions
    • 4.17.4+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 4.17.4+dfsg-1ubuntu0.1~esm1

    Update to 4.17.4+dfsg-1ubuntu0.1~esm1

  • node-lodash Ubuntu:Pro:20.04:LTS

    Versions
    • 4.17.11+dfsg-4
    • 4.17.15+dfsg-2
    Affected ranges
    • ECOSYSTEM: < 4.17.15+dfsg-2ubuntu0.1~esm1

    Update to 4.17.15+dfsg-2ubuntu0.1~esm1

  • node-lodash Ubuntu:Pro:22.04:LTS

    Versions
    • 4.17.21+dfsg+~cs8.31.173-1
    • 4.17.21+dfsg+~cs8.31.196.20210220-2
    • 4.17.21+dfsg+~cs8.31.198.20210220-4
    • 4.17.21+dfsg+~cs8.31.198.20210220-5
    Affected ranges
    • ECOSYSTEM: < 4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1

    Update to 4.17.21+dfsg+~cs8.31.198.20210220-5ubuntu0.1~esm1

  • node-lodash Ubuntu:Pro:24.04:LTS

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    Affected ranges
    • ECOSYSTEM: < 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1

    Update to 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.24.04.1~esm1

  • node-lodash Ubuntu:25.10

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    Affected ranges
    • ECOSYSTEM: < 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1

    Update to 4.17.21+dfsg+~cs8.31.198.20210220-9ubuntu0.25.10.1

  • node-lodash Ubuntu:26.10

    Versions
    • 4.17.23+dfsg-1
    • 4.18.1+dfsg-3
    • 4.18.1+dfsg1-1
    • 4.18.1+dfsg1-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • node-lodash Ubuntu:Pro:26.04:LTS

    Versions
    • 4.17.21+dfsg+~cs8.31.198.20210220-9
    • 4.17.23+dfsg-1
    Affected ranges
    • ECOSYSTEM: < 4.17.23+dfsg-1ubuntu0.1~esm1

    Update to 4.17.23+dfsg-1ubuntu0.1~esm1

Original sources

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