Is CVE-2026-27606 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-27606, but active exploitation has not been confirmed.

Can CVE-2026-27606 be exploited remotely?

Yes. CVE-2026-27606 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27606?

CVE-2026-27606 has a CVSS score of 9.8 (CRITICAL) and an EPSS exploitation probability of 0.47%.

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CRITICALPOC

CVE-2026-27606

CWE-22Published: February 25, 2026· Updated: Feb 25, 2026

9.8

CVSS v3.1

EPSS:0.47%probability of exploitation in 30 daysPercentile:64.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-27606 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

A proof-of-concept (PoC) exploit exists for CVE-2026-27606. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.