CVE-2026-109574: Hugo before v0.167.0 Path Traversal via css.Sass Import Fallback

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-12 · updated 2026-10-26
Weakness: CWE-22

Description

Hugo before v0.167.0 contains a path traversal vulnerability in css.Sass that allows malicious themes or modules to read files outside the project root through the Sass compiler's import fallback. Attackers can ship stylesheets with relative, absolute, or symlinked @import or @use targets to compile readable files into the published site CSS.

Affected products

gohugoio hugo: before 0.167.0 — fixed in 0.167.0

How to fix

Upgrade to a fixed version: gohugoio hugo 0.167.0. Check the vendor advisory for mitigations.

References

https://github.com/gohugoio/hugo/security/advisories/GHSA-3jfr-vjcq-7jvf
https://www.vulncheck.com/advisories/hugo-before-0.167.0-path-traversal-via-css-sass-import-fallback

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