Is this vulnerability remotely exploitable?

It can be, depending on how Rollup is integrated. If a remote user can influence input names, configuration, or plugins (for example, via a web interface that triggers builds or a multi-tenant CI service), they may remotely trigger arbitrary file writes. In local-only build setups with no untrusted inputs, exposure is reduced.

What level of access does an attacker need?

An attacker needs the ability to control or significantly influence Rollup's output naming—through CLI parameters, configuration files, or custom plugins. They do not typically need shell access to the build host, but they must be able to reach the part of the system that prepares or runs the Rollup build.

What is the safest general fix pattern?

The safest approach is to enforce strict directory confinement for all outputs, normalize and validate paths after resolution, and forbid path traversal or absolute paths in any user- or plugin-controlled name. Combined with least-privilege execution of build processes, this substantially limits the attack surface.

Severity:

CRITICAL RISK

(9.8)

Arbitrary File Write via Path Traversal (CWE-22) in Rollup Module Bundler Core Engine

CVE-2026-27606

Published:

Feb 24, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22

Impact:

Arbitrary File Write leading to Potential Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Path Traversal / Arbitrary File Write

CWE:

CWE-22

Impact:

Arbitrary File Write leading to Potential Remote Code Execution

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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Arbitrary File Write via Path Traversal (CWE-22) in Rollup Module Bundler Core Engine

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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