What’s Vulnerable › Vulnerabilities

CVE-2022-31106: Prototype Pollution in underscore.deep

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-06-28 · updated 2026-06-17
• Weakness: CWE-915

Description

Underscore.deep is a collection of Underscore mixins that operate on nested objects. Versions of `underscore.deep` prior to version 0.5.3 are vulnerable to a prototype pollution vulnerability. An attacker can craft a malicious payload and pass it to `deepFromFlat`, which would pollute any future Objects created. Any users that have `deepFromFlat` or `deepPick` (due to its dependency on `deepFromFlat`) in their code should upgrade to version 0.5.3 as soon as possible. Users unable to upgrade may mitigate this issue by modifying `deepFromFlat` to prevent specific keywords which will prevent this from happening.

Affected products

• Clever underscore.deep: before 0.5.3 — fixed in 0.5.3

How to fix

Upgrade to a fixed version: Clever underscore.deep 0.5.3. Check the vendor advisory for mitigations.

References

• https://github.com/Clever/underscore.deep/commit/b5e109ad05b48371be225fa4d490dd08a94e8ef7
• https://github.com/Clever/underscore.deep/security/advisories/GHSA-8j79-hfj5-f2xm
• https://github.com/Clever/underscore.deep/commit/b5e109ad05b48371be225fa4d490dd08a94e8ef7
• https://github.com/Clever/underscore.deep/security/advisories/GHSA-8j79-hfj5-f2xm

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