Cross-site Scripting (XSS) Affecting k3s package, versions <1.35.3.1-r8
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-CHAINGUARDLATEST-K3S-16633815
- published11 May 2026
- disclosed7 May 2026
Introduced: 7 May 2026
NewCVE-2026-39823 (opens in a new tab)How to fix?
Upgrade Chainguard k3s to version 1.35.3.1-r8 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream k3s package and not the k3s package as distributed by Chainguard.
See How to fix? for Chainguard 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.