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CVE-2026-89259: hugo

Severity

9.3 (CRITICAL)

Vendor

GOHUGOIO

Affected versions

0 through before 0.165.0

Fixed version

0.165.0

Patch status

Patched

Published

2026-09-11T12:16:56.480

Modified

2026-09-11T21:17:57.873

Why it matters

Critical vulnerability requiring immediate validation against your environment.

Recommended admin actions

• Prioritize validation immediately due to critical CVSS severity.

Technical summary

Hugo is a static site generator. From v0.161.0, Hugo executes Node tools under Node's permission model, but TailwindCSS — included in the default security.exec.allow list — requires a highly permissive configuration (–allow-addons, –allow-child-process, –allow-worker). As a result, the restrictions intended by the fix for GHSA-x597-9fr4-5857 could still be bypassed, allowing a Node tool invoked during a build to read and write files outside the project's working directory. Affected versions are those after v0.43; the issue was fixed in v0.165.0 by removing tailwindcss from the default security.exec.allow list. Users who do not use TailwindCSS, or who only build trusted sites, are not affected. As a workaround, users can define a restrictive security.exec.allow list in hugo.toml.

View the official NVD record for CVE-2026-89259

CVE data is sourced from NVD/CNA records and optional enrichment. Validate against the vendor advisory before taking production action.