What’s Vulnerable › Vulnerabilities

CVE-2026-27837: Dottie vulnerable to prototype pollution bypass via non-first path segments in set() and transform()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-02-26 · updated 2026-06-17
• Weakness: CWE-1321

Description

Dottie provides nested object access and manipulation in JavaScript. Versions 2.0.4 through 2.0.6 contain an incomplete fix for CVE-2023-26132. The prototype pollution guard introduced in commit `7d3aee1` only validates the first segment of a dot-separated path, allowing an attacker to bypass the protection by placing `__proto__` at any position other than the first. Both `dottie.set()` and `dottie.transform()` are affected. Version 2.0.7 contains an updated fix to address the residual vulnerability.

Affected products

• mickhansen dottie.js: from 2.0.4 before 2.0.7 — fixed in 2.0.7

How to fix

Upgrade to a fixed version: mickhansen dottie.js 2.0.7. Check the vendor advisory for mitigations.

References

• https://github.com/advisories/GHSA-4gxf-g5gf-22h4
• https://github.com/mickhansen/dottie.js/commit/7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14
• https://github.com/mickhansen/dottie.js/security/advisories/GHSA-r5mx-6wc6-7h9w
• https://github.com/mickhansen/dottie.js/security/advisories/GHSA-r5mx-6wc6-7h9w

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