Reachable Assertion Affecting k3s package, versions <1.34.1.1-r1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.11% (30th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-K3S-13549976
  • published15 Oct 2025
  • disclosed10 Oct 2025

Introduced: 10 Oct 2025

CVE-2025-59530  (opens in a new tab)
CWE-617  (opens in a new tab)
CWE-755  (opens in a new tab)

How to fix?

Upgrade Chainguard k3s to version 1.34.1.1-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.

quic-go is an implementation of the QUIC protocol in Go. In versions prior to 0.49.0, 0.54.1, and 0.55.0, a misbehaving or malicious server can cause a denial-of-service (DoS) attack on the quic-go client by triggering an assertion failure, leading to a process crash. This requires no authentication and can be exploited during the handshake phase. This was observed in the wild with certain server implementations. quic-go needs to be able to handle misbehaving server implementations, including those that prematurely send a HANDSHAKE_DONE frame. Versions 0.49.0, 0.54.1, and 0.55.0 discard Initial keys when receiving a HANDSHAKE_DONE frame, thereby correctly handling premature HANDSHAKE_DONE frames.

CVSS Base Scores

version 3.1