High
Rollup 4 has Arbitrary File Write via Path Traversal
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-27606
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 12:01 UTC · Revision 1
Source evidence
Rollup 4 has Arbitrary File Write via Path Traversal
core-osv · Original sourcePublished 25 Feb 2026, 02:08 UTC
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.
osv:CVE-2026-27606
Complete source record
{
"id": "fd90a0f1634142f441e24388c28e75138912e8372044c51f244c54afe03f6f25",
"url": "https://osv.dev/vulnerability/CVE-2026-27606",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Rollup 4 has Arbitrary File Write via Path Traversal",
"summary": "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.",
"evidence": "osv:CVE-2026-27606",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-27606",
"aliases": [
"CVE-2026-27606",
"GHSA-mw96-cpmx-2vgc"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
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"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-27606.json"
}
}
],
"modified": "2026-10-28T02:30:34.925971723Z",
"provider": "osv",
"references": [
"https://github.com/rollup/rollup/releases/tag/v2.80.0",
"https://github.com/rollup/rollup/releases/tag/v3.30.0",
"https://github.com/rollup/rollup/releases/tag/v4.59.0",
"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27606.json",
"https://access.redhat.com/errata/RHSA-2026:10175",
"https://access.redhat.com/errata/RHSA-2026:13508",
"https://access.redhat.com/errata/RHSA-2026:13512",
"https://access.redhat.com/errata/RHSA-2026:13545",
"https://access.redhat.com/errata/RHSA-2026:5132",
"https://access.redhat.com/errata/RHSA-2026:5649",
"https://access.redhat.com/errata/RHSA-2026:5665",
"https://access.redhat.com/errata/RHSA-2026:6174",
"https://access.redhat.com/errata/RHSA-2026:6802",
"https://access.redhat.com/errata/RHSA-2026:8483",
"https://access.redhat.com/security/cve/CVE-2026-27606",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27606.json",
"https://github.com/rollup/rollup/security/advisories/GHSA-mw96-cpmx-2vgc",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27606",
"https://bugzilla.redhat.com/show_bug.cgi?id=2442530",
"https://github.com/rollup/rollup/commit/c60770d7aaf750e512c1b2774989ea4596e660b2",
"https://github.com/rollup/rollup/commit/c8cf1f9c48c516285758c1e11f08a54f304fd44e",
"https://github.com/rollup/rollup/commit/d6dee5e99bb82aac0bee1df4ab9efbde455452c3"
],
"provider_metadata": {
"cwe_ids": [
"CWE-22"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/27xxx/CVE-2026-27606.json"
}
},
"related_cves": [
{
"value": "CVE-2026-27606",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 502249,
"published_at": "2026-02-25T02:08:06.682+00:00"
}