Cross-site Scripting (XSS) Affecting knative-eventing-1.21 package, versions <1.21.4-r10


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.31% (23rd percentile)

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  • Snyk IDSNYK-WOLFILATEST-KNATIVEEVENTING121-19827561
  • published15 Sept 2026
  • disclosed7 May 2026

Introduced: 7 May 2026

CVE-2026-39823  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Wolfi knative-eventing-1.21 to version 1.21.4-r10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream knative-eventing-1.21 package and not the knative-eventing-1.21 package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.

CVSS Base Scores

version 3.1