CVE-2026-25521

Description

A prototype pollution flaw has been discovered in the Locutus npm library. Despite a previous fix that attempted to mitigate prototype pollution by checking whether user input contained a forbidden key, it is still possible to pollute Object.prototype via a crafted input using String.prototype.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

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 HatNVDcve.org
Base Score9.38.89.3
Attack VectorLocalLocalLocal
Attack ComplexityLowLowLow
Privileges RequiredNoneLowNone
User InteractionNoneNoneNone
ScopeChangedChangedChanged
ConfidentialityHighHighHigh
Integrity ImpactHighHighHigh
Availability ImpactHighHighHigh

Vector

Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

cve.org: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Understanding the Weakness (CWE)

CWE-915

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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