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CVE-2026-27606

9.8 · CRITICAL

Rollup is a module bundler for JavaScript.

Published Feb 25, 2026CWE-22EPSS 1.58%

Overview

CVE-2026-27606 is a critical-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/rollup/rollup/commit/c60770d7aaf750e512c1b2774989ea4596e660b2GitHubgithub.com/rollup/rollup/commit/c8cf1f9c48c516285758c1e11f08a54f304fd44eGitHubgithub.com/rollup/rollup/commit/d6dee5e99bb82aac0bee1df4ab9efbde455452c3GitHubgithub.com/rollup/rollup/releases/tag/v2.80.0GitHubgithub.com/rollup/rollup/releases/tag/v3.30.0GitHubgithub.com/rollup/rollup/releases/tag/v4.59.0GitHubgithub.com/rollup/rollup/security/advisories/GHSA-mw96-cpmx-2vgcRefaccess.redhat.com/errata/RHSA-2026:10175Refaccess.redhat.com/errata/RHSA-2026:13508Refaccess.redhat.com/errata/RHSA-2026:13512

How CyberStrike helps

Frequently asked questions

What is CVE-2026-27606?

CVE-2026-27606 is a critical-severity vulnerability. It was published on February 25, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-27606?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-27606?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-27606?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-27606 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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