CVE-2026-27837
Description
A flaw was found in dottie.js, a JavaScript library for nested object access and manipulation. An incomplete fix for a previous vulnerability allows a remote attacker to bypass prototype pollution protection by placing 'proto' at any position other than the first in a dot-separated path. This vulnerability affects the dottie.set() and dottie.transform() functions. Successful exploitation can lead to unauthorized modification of object properties, potentially causing unexpected application behavior, information disclosure, or denial of service.
Statement
This vulnerability is rated as Moderate by Red Hat. Successful exploitation requires user interaction, since the two vulnerable functions, dottie.set() and dottie.transform(), first need to be passed an accepted attacker-controlled input (ex. by parsing a query string). Furthermore, the result of a successful exploitation may result in limited and indirect leakage of sensitive data (largely dependent upon the context in which the application is used), limited integrity impact (since the attack does not allow for arbitrary memory or code overwriting), and limited availability impact potentially causing the application to crash (DoS).
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.3 | 9.8 | 6.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | Required | None | Required |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | Low | High | Low |
| Integrity Impact | Low | High | Low |
| Availability Impact | Low | High | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
An attacker could modify sensitive data or program variables.
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
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