Resource Exhaustion Affecting k3s-1.33 package, versions <1.33.9.1-r3


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.41% (33rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-K3S133-15703316
  • published20 Mar 2026
  • disclosed12 Feb 2026

Introduced: 12 Feb 2026

CVE-2026-21435  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

Upgrade Chainguard k3s-1.33 to version 1.33.9.1-r3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream k3s-1.33 package and not the k3s-1.33 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 v0.10.0, an attacker can cause a denial of service in webtransport-go by preventing or indefinitely delaying WebTransport session closure. A malicious peer can withhold QUIC flow control credit on the CONNECT stream, blocking transmission of the WT_CLOSE_SESSION capsule and causing the close operation to hang. This vulnerability is fixed in v0.10.0.

CVSS Base Scores

version 3.1