Deadlock Affecting container-tools:rhel8/podman-docker package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.38% (31st percentile)

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  • Snyk IDSNYK-RHEL8-CONTAINERTOOLS-19736904
  • published13 Sept 2026
  • disclosed2 Sept 2026

Introduced: 2 Sep 2026

NewCVE-2026-56855  (opens in a new tab)
CWE-833  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 container-tools:rhel8/podman-docker.

NVD Description

Note: Versions mentioned in the description apply only to the upstream container-tools:rhel8/podman-docker package and not the container-tools:rhel8/podman-docker package as distributed by RHEL. See How to fix? for RHEL:8 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