Cross-site Scripting (XSS) Affecting hugo package, versions *


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.22% (12th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-HUGO-19270624
  • published27 Aug 2026
  • disclosed24 Aug 2026

Introduced: 24 Aug 2026

NewCVE-2026-10618  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable hugo.

NVD Description

Note: Versions mentioned in the description apply only to the upstream hugo package and not the hugo package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Hugo's default fenced-code-block renderer writes attribute values taken from the code-fence info string into the rendered HTML without escaping them. New in markup/internal/attributes/attributes.go converts every attribute value from a byte slice to a string as it is stored, deliberately dropping the escaping that used to happen there, and RenderAttributes in the same file escapes only values that are still byte slices, so its escaping branch is never reached and every value is written verbatim. The function's documentation states that it performs HTML escaping of string attributes, which it does not. A quote inside an attribute value in the info string therefore terminates the attribute and allows a further attribute, including an event handler, to be placed on the wrapper element, and the script runs for every visitor who loads the page. This path is reached under the default configuration, with code fences enabled and without goldmark's unsafe setting or any custom render hook. Attribute names beginning with on are filtered when the attributes are parsed, so injection is achieved through the value rather than the name.

CVSS Base Scores

version 3.1