HIGHVulnerability
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Global

NVD HIGH: CVE-2026-100690 — Hugo versions from v0.161.0 through v0.165.0 run Node.js tools (css.PostCSS, css...

·Source: NIST NVD

Updated:

Executive Summary

Hugo versions from v0.161.0 through v0.165.0 run Node.js tools (css.PostCSS, css.TailwindCSS, js.Babel) under the Node.js permission model to restrict file system reads to the project directory and configured mounts. Because the Node.js permission model validates only the lexical path and follows symbolic links that point outside the allowed set, Hugo did not detect symlinks escaping the sandbox.

Analysis

Hugo versions from v0.161.0 through v0.165.0 run Node.js tools (css.PostCSS, css.TailwindCSS, js.Babel) under the Node.js permission model to restrict file system reads to the project directory and configured mounts. Because the Node.js permission model validates only the lexical path and follows symbolic links that point outside the allowed set, Hugo did not detect symlinks escaping the sandbox. An attacker who can contribute content to a Hugo project (for example via a pull request) can commit a symlink such as assets/css/x.css -> /etc/passwd together with a PostCSS plugin that reads it, allowing any file readable by the Hugo build process to be disclosed and potentially embedded in the published site. This affects builds using the default security configuration; projects that do not invoke Node.js tools are unaffected. Fixed in v0.166.0, which scans allowed paths and fails the build when a symbolic link resolves outside them. CVSS Score: 7.5. Published: 2026-09-26T14:16:53.560.

Indicators of Compromise (1)

CVE (1)
CVE-2026-100690
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Sep 26, 2026. Verified by: NIST.

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