Name: CVE-2026-56855: Allocation of Resources Without Limits or Throttling
Creator: Rapid7
Published: 2026-09-02T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-56855, CWE-770, CVSS 7.5, EPSS 0.005

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 Details

CVSS 3.1 Base Score: 7.5
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade buildah-testsUpgrade buildah	Oct 11, 2026	Sep 23, 2026
Amazon Linux Ami 2	—	Upgrade runfinch-finchUpgrade amazon-ssm-agent	Oct 19, 2026	Oct 19, 2026
Amazon_linux_2023	—	Upgrade amazon-ssm-agentUpgrade rcloneUpgrade rclone-debugsourceUpgrade rclone-debuginfoUpgrade runfinch-finchUpgrade containerd-stress-debuginfoUpgrade containerd-stressUpgrade containerdUpgrade containerd-debugsourceUpgrade nerdctlUpgrade containerd-debuginfo	Sep 30, 2026	Sep 2, 2026
Oracle_linux	—	Upgrade buildahUpgrade buildah-tests	Oct 22, 2026	Sep 2, 2026
Redhat_linux	—	Upgrade buildah-debugsourceUpgrade buildah-tests-debuginfoNo solution existsUpgrade buildah-testsUpgrade buildahUpgrade buildah-debuginfo	Sep 10, 2026	Sep 2, 2026
Rocky_linux	—	Upgrade buildah-testsUpgrade buildah-debugsourceUpgrade buildahUpgrade buildah-tests-debuginfoUpgrade buildah-debuginfo	Sep 28, 2026	Sep 24, 2026

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CVSS Details

Covered by Rapid7

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