Prototype Pollution in lodash

CVE-2019-10744 → View on GitHub ↗ View on CVE.org ↗ View on NVD ↗

Description

Versions of lodash before 4.17.12 are vulnerable to Prototype Pollution. The function defaultsDeep allows a malicious user to modify the prototype of Object via {constructor: {prototype: {...}}} causing the addition or modification of an existing property that will exist on all objects.

Recommendation

Update to version 4.17.12 or later.

Basic information

Type
reviewed
Severity
critical
Advisory on GitHub
Open advisory ↗
Repository advisory
—
Source code
Not specified
Published (advisory)
2019-07-10 19:45:23 UTC
Updated
2025-08-12 21:43:02 UTC
GitHub reviewed
2019-07-10 19:41:11 UTC
NVD published
2019-07-25

EPSS Score

Score Percentile
3.25% 86.92%

CVSS Scores

Base score Version Severity Vector
9.1 3.1 —
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.

Identifiers

Type Value
GHSA GHSA-jf85-cpcp-j695 ↗
CVE CVE-2019-10744 ↗

CWEs

CWE id Name
CWE-20 Improper Input Validation
CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Credits

  • G-Rath (analyst)

Affected packages (5)

Vulnerable version ranges and first patched releases as published by GitHub.

Ecosystem Package Vulnerable range First patched Vulnerable functions
npm lodash < 4.17.12 4.17.12 —
npm lodash-es < 4.17.14 4.17.14 —
npm lodash-amd < 4.17.13 4.17.13 —
npm lodash.defaultsdeep < 4.6.1 4.6.1 —
rubygems lodash-rails < 4.17.12 4.17.12 —

References

cvelogic Threat Intelligence