CVE-2026-27606 Rollupjs — Exploit & Vulnerability Details HIGH

Parameter	Value
CVSS	8.8 (HIGH)
Affected Versions	3.0.0 — 4.59.0
Fixed In	2.80.0
Type	CWE-22 (Path Traversal)
Vendor	Rollupjs
Public PoC	No

Rollup is a module bundler for JavaScript. Versions prior to 2.80.0, 3.30.0, and 4.59.0 of the Rollup module bundler (specifically v4.x and present in current source) is vulnerable to an Arbitrary File Write via Path Traversal. Insecure file name sanitization in the core engine allows an attacker to control output filenames (e.g., via CLI named inputs, manual chunk aliases, or malicious plugins) and use traversal sequences (`../`) to overwrite files anywhere on the host filesystem that the build process has permissions for.

This can lead to persistent Remote Code Execution (RCE) by overwriting critical system or user configuration files. Versions 2.80.0, 3.30.0, and 4.59.0 contain a patch for the issue.

Attack Parameters

Attack Vector

Network

Can be exploited remotely

Attack Complexity

Low

Easy to exploit

Attack Requirements

None

No additional conditions

Privileges Required

None

No privileges needed

User Interaction

None

No user interaction needed

Impact Assessment

Confidentiality

High

Complete data leak

Integrity

High

Complete data modification

Availability

None

No disruption

CVSS Vector v4.0

Weakness Type (CWE)

CWE-22 Path Traversal

Vulnerable Products 3

Configuration	From (including)	Up to (excluding)
Rollupjs Rollup cpe:2.3:a:rollupjs:rollup::::::node.js::*	—	`2.80.0`
Rollupjs Rollup cpe:2.3:a:rollupjs:rollup::::::node.js::*	`3.0.0`	`3.30.0`
Rollupjs Rollup cpe:2.3:a:rollupjs:rollup::::::node.js::*	`4.0.0`	`4.59.0`