Prototype Pollution in Dottie Project
CVE-2026-27837
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.
Vulnerability class: Prototype Pollution
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (43.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
- Dottie Project
- Mickhansen Dottie.js — versions >= 2.0.4, < 2.0.7
Weakness classification (CWE)
References
- github.com/mickhansen/dottie.js/security/advisories/GHSA-r5mx-6wc6-7h9w (Exploit, Vendor Advisory)
- github.com/mickhansen/dottie.js/commit/7e8fa1345a4b46325f0eab8d7aeb1c4deaefdb14 (Patch)
- github.com/advisories/GHSA-4gxf-g5gf-22h4 (Not Applicable)
Frequently asked questions
- What is CVE-2026-27837?
- CVE-2026-27837 is a medium-severity vulnerability in Dottie Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 6.3/10. Published 2026-02-26.
- How severe is CVE-2026-27837?
- Medium severity. CVSS v3 base score is 6.3 out of 10.