Name: CVE-2026-39834: Integer Overflow or Wraparound
Creator: Rapid7
Published: 2026-05-22T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-39834, CWE-190, CVSS 9.1, EPSS 0.00637

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

CVSS Details

CVSS 3.1 Base Score: 9.1
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Amazon Linux Ami 2	—	Upgrade containerdUpgrade runfinch-finchUpgrade amazon-ssm-agentUpgrade containerd-debuginfoUpgrade containerd-stressUpgrade amazon-cloudwatch-agentUpgrade nerdctlUpgrade nerdctl-debuginfo	Jun 9, 2026	Jun 9, 2026
Amazon_linux_2023	—	Upgrade amazon-ssm-agentUpgrade containerdUpgrade nerdctlUpgrade containerd-debuginfoUpgrade amazon-cloudwatch-agentUpgrade rclone-debuginfoUpgrade runfinch-finchUpgrade containerd-stressUpgrade rclone-debugsourceUpgrade rcloneUpgrade containerd-stress-debuginfoUpgrade containerd-debugsource	Jun 9, 2026	May 22, 2026
Redhat_linux	—	No solution exists	Oct 16, 2026	May 22, 2026
Ubuntu	—	Upgrade google-guest-agentUpgrade golang-go.crypto-dev (Ubuntu Pro)Upgrade google-guest-agent (Ubuntu Pro)Upgrade golang-golang-x-crypto-dev (Ubuntu Pro)Upgrade lxd (Ubuntu Pro)	Jun 18, 2026	Jun 17, 2026

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CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence