Memory Leak Affecting k3s package, versions <1.35.1.1-r1
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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Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-K3S-15351722
- published25 Feb 2026
- disclosed12 Feb 2026
Introduced: 12 Feb 2026
CVE-2026-21438 (opens in a new tab)How to fix?
Upgrade Chainguard k3s to version 1.35.1.1-r1 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.
webtransport-go is an implementation of the WebTransport protocol. Prior to 0.10.0, an attacker can cause unbounded memory consumption repeatedly creating and closing many WebTransport streams. Closed streams were not removed from an internal session map, preventing garbage collection of their resources. This vulnerability is fixed in v0.10.0.