CVE-2026-56855 Affecting argo-events package, versions <1.9.11-r10


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.38% (31st percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-ARGOEVENTS-19539233
  • published5 Sept 2026
  • disclosed2 Sept 2026

Introduced: 2 Sep 2026

NewCVE-2026-56855  (opens in a new tab)

How to fix?

Upgrade Chainguard argo-events to version 1.9.11-r10 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream argo-events package and not the argo-events package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.

CVSS Base Scores

version 3.1