CVE-2025-69262: pnpm Command Injection RCE Vulnerability

CVE-2025-69262 Overview

CVE-2025-69262 is a Command Injection vulnerability affecting pnpm, a popular JavaScript package manager. Versions 6.25.0 through 10.26.2 are vulnerable when using environment variable substitution in .npmrc configuration files with tokenHelper settings. An attacker who can control environment variables during pnpm operations could achieve Remote Code Execution (RCE) in build environments.

Critical Impact

This vulnerability enables Remote Code Execution in CI/CD pipelines and build environments where attackers can manipulate environment variables, potentially compromising entire software supply chains.

Affected Products

• pnpm versions 6.25.0 through 10.26.2
• Build environments using pnpm with .npmrc tokenHelper configurations
• CI/CD pipelines with environment variable exposure

Discovery Timeline

• 2026-01-07 - CVE CVE-2025-69262 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-69262

Vulnerability Analysis

This vulnerability (CWE-78: Improper Neutralization of Special Elements used in an OS Command) stems from insufficient input sanitization when pnpm processes environment variable substitutions within .npmrc configuration files, specifically in the context of tokenHelper settings. The tokenHelper feature is designed to allow dynamic token generation for private registry authentication, but the implementation fails to properly sanitize environment variable values before incorporating them into shell commands.

When pnpm encounters environment variable references in the .npmrc file's tokenHelper directive, it performs substitution without adequately escaping shell metacharacters. This allows an attacker with control over environment variables to inject arbitrary commands that execute with the privileges of the pnpm process.

The attack requires local access and high privileges to manipulate environment variables, combined with specific configuration conditions, which moderately limits the exploitation window. However, in CI/CD environments where environment variables are commonly used for configuration, this vulnerability poses a significant supply chain security risk.

Root Cause

The root cause is improper neutralization of special elements in environment variable values before they are used in OS command construction. The pnpm codebase did not implement sufficient input validation and escaping for shell metacharacters when processing tokenHelper configurations that reference environment variables. This allowed shell command syntax to pass through and be interpreted by the underlying shell during execution.

Attack Vector

The attack requires local access to the system where pnpm is executed. An attacker must be able to set or modify environment variables that are subsequently referenced in the .npmrc file's tokenHelper configuration. In practice, this is most relevant in:

• CI/CD pipelines: Where build configurations may inadvertently expose environment variable control
• Shared build servers: Where multiple users or processes can set environment variables
• Container environments: Where environment variables are commonly used for configuration injection

The vulnerability is exploited by crafting malicious environment variable values containing shell metacharacters and commands. When pnpm processes the .npmrc file and evaluates the tokenHelper setting, these injected commands are executed.

The attack mechanism involves placing shell metacharacters (such as backticks, $() command substitution syntax, or semicolons) within environment variable values that are referenced by the tokenHelper configuration. For detailed technical information, refer to the GitHub Security Advisory GHSA-2phv-j68v-wwqx.

Detection Methods for CVE-2025-69262

Indicators of Compromise

• Unusual environment variable values containing shell metacharacters in build logs
• Unexpected child processes spawned by pnpm during package operations
• Anomalous network connections or file system access during npm/pnpm install phases
• Modified or suspicious .npmrc files with complex tokenHelper configurations

Detection Strategies

• Monitor process execution trees for unexpected child processes spawned by pnpm
• Implement environment variable auditing in CI/CD pipelines to detect suspicious values
• Use SentinelOne's behavioral AI to identify command injection patterns during build processes
• Review .npmrc configurations for tokenHelper settings that reference external environment variables

Monitoring Recommendations

• Enable detailed logging for pnpm operations in build environments
• Implement file integrity monitoring for .npmrc configuration files
• Configure alerting for unusual command patterns executed during package manager operations
• Deploy SentinelOne agents on build servers to detect and respond to RCE attempts in real-time

How to Mitigate CVE-2025-69262

Immediate Actions Required

• Upgrade pnpm to version 10.27.0 or later immediately
• Audit all .npmrc files for tokenHelper configurations that use environment variable substitution
• Review CI/CD pipeline configurations to limit environment variable exposure
• Implement environment variable validation before pnpm execution

Patch Information

The vulnerability has been addressed in pnpm version 10.27.0. This release includes proper sanitization of environment variable values when used in tokenHelper and similar configuration contexts. Users should upgrade immediately by running npm install -g pnpm@latest or updating their package manager pinning configurations.

For detailed patch information, see the GitHub Release v10.27.0.

Workarounds

• Avoid using environment variable substitution in tokenHelper configurations until patched
• Use static token values or secure credential management systems instead of environment variables
• Implement strict input validation for any environment variables used in build processes
• Restrict environment variable setting permissions in shared build environments

# Verify pnpm version and upgrade if vulnerable
pnpm --version

# Upgrade to patched version
npm install -g pnpm@10.27.0

# Audit .npmrc files for tokenHelper usage
grep -r "tokenHelper" ~/.npmrc .npmrc 2>/dev/null