CVE-2026-27606: Rollup is a module bundler for JavaScript

This week

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-27606 is a critical-severity flaw (CVSS 9.8) affecting rollup. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 fi

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 24%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-02-25
Last modified	2026-09-10

Publisher (CNA): GitHub, Inc. · Vendor: rollupjs

Last updated 2026-09-10 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 03:16 UTCPublished CVE record published
2026-09-10 13:18 UTCUpdated Record last modified

rollupjs rollup UPGRADE

Affected: < 2.80.0 · >= 3.0.0 and < 3.30.0 · >= 4.0.0 and < 4.59.0

Fixed in: 2.80.0, 3.30.0, 4.59.0

Safe to downgrade to: a release before 3.0.0

1. Check installed version

npm ls rollup

2. UPGRADE to 2.80.0

npm install rollup@">=2.80.0"

3. If no update is available yet, DOWNGRADE to a release before 3.0.0

npm view rollup versions npm install rollup@"<3.0.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

npm · rollup · FIXED · 2.80.0 · vulnerable: < 2.80.0 · source

npm install rollup@">=2.80.0" npm ls rollup

Fedora 46 · R · FIXED · 4.6.2-1.fc46 · FEDORA-2026-1dd919a262 · source

sudo dnf upgrade --advisory=FEDORA-2026-1dd919a262

Fedora ELN · perl-Mail-AuthenticationResults · FIXED · 2.20261029-1.eln159 · FEDORA-2026-a2c11d7da6 · source

sudo dnf upgrade --advisory=FEDORA-2026-a2c11d7da6

Debian 12 · node-rollup · NO FIX YET

Debian 13 · node-rollup · NO FIX YET

RHEL 10 · grafana · NOT AFFECTED

RHEL 8 · grafana · NOT AFFECTED

RHEL 8 · pcs · NOT AFFECTED

RHEL 9 · grafana · NOT AFFECTED

RHEL 9 · pcs · NOT AFFECTED

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

GitHub PoC: AaaronP/Seguridad---Proyecto-de-investigaci-n (0 stars)
Write-up: github.com/rollup/rollup/security/advisories/GHSA-mw96-cpmx-2vgc

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-27606?

rollup: upgrade to 2.80.0, 3.30.0, 4.59.0. Exact commands for each OS are on this page.

Is CVE-2026-27606 being exploited?

CVE-2026-27606 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-27606 affect?

CVE-2026-27606 affects rollup. Severity is critical (CVSS 9.8). 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 fil

How urgent is CVE-2026-27606?

Priority 66/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2024-47068 MEDIUM 6.1 UPGRADE Rollup is a module bundler for JavaScript

References

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