Description
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.
Affected products
rollupjs: rollup
References10
- github.com/rollup/rollup/security/advisories/GHSA-mw96-cpmx-2vgc ExploitVendor Advisory
- github.com/rollup/rollup/commit/c60770d7aaf750e512c1b2774989ea4… Patch
- github.com/rollup/rollup/commit/c8cf1f9c48c516285758c1e11f08a54… Patch
- github.com/rollup/rollup/commit/d6dee5e99bb82aac0bee1df4ab9efbd… Patch
- github.com/rollup/rollup/releases/tag/v2.80.0 Product
- github.com/rollup/rollup/releases/tag/v3.30.0 Product
- github.com/rollup/rollup/releases/tag/v4.59.0 Product
- access.redhat.com/errata/RHSA-2026:10175
- access.redhat.com/errata/RHSA-2026:13508
- access.redhat.com/errata/RHSA-2026:13512
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 4.0
-
8.8
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 2% percentile: 77 · as of 12 November 2026
- CWE
- CWE-22
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.