CVE-2026-27606
CriticalCVSS 9.8Exploitation Probability (EPSS)
Elevated risk69th percentile - higher than 69% of all known CVEs
Summary
Rollup, a JavaScript module bundler, is vulnerable to arbitrary file write via path traversal. Insecure filename sanitization in the core engine allows an attacker to use traversal sequences (`../`) to overwrite files outside the intended output directory.
Risk Assessment
An attacker can overwrite critical system or user configuration files, potentially leading to persistent remote code execution (RCE) on the server or workstation where the build process runs.
Recommendation
Immediately upgrade Rollup to version 2.80.0, 3.30.0, or 4.59.0 (depending on your major version), which contain the fix for this vulnerability.
Original NVD description (English source)
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.