Allocation of Resources Without Limits or Throttling Affecting rke2-runtime-1.35 package, versions <1.35.1.2.1-r2


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-RKE2RUNTIME135-15337446
  • published24 Feb 2026
  • disclosed12 Feb 2026

Introduced: 12 Feb 2026

CVE-2026-21434  (opens in a new tab)
CWE-770  (opens in a new tab)

How to fix?

Upgrade Chainguard rke2-runtime-1.35 to version 1.35.1.2.1-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rke2-runtime-1.35 package and not the rke2-runtime-1.35 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. From 0.3.0 to 0.9.0, an attacker can cause excessive memory consumption in webtransport-go's session implementation by sending a WT_CLOSE_SESSION capsule containing an excessively large Application Error Message. The implementation does not enforce the draft-mandated limit of 1024 bytes on this field, allowing a peer to send an arbitrarily large message payload that is fully read and stored in memory. This allows an attacker to consume an arbitrary amount of memory. The attacker must transmit the full payload to achieve the memory consumption, but the lack of any upper bound makes large-scale attacks feasible given sufficient bandwidth. This vulnerability is fixed in 0.10.0.

CVSS Base Scores

version 3.1