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 nerdctlUpgrade nerdctl-debuginfoUpgrade amazon-cloudwatch-agentUpgrade containerd-stressUpgrade containerdUpgrade amazon-ssm-agentUpgrade containerd-debuginfoUpgrade runfinch-finch	Jun 9, 2026	Jun 9, 2026
Amazon_linux_2023	—	Upgrade containerd-debugsourceUpgrade rcloneUpgrade containerd-stress-debuginfoUpgrade runfinch-finchUpgrade containerd-debuginfoUpgrade containerd-stressUpgrade amazon-ssm-agentUpgrade containerdUpgrade rclone-debugsourceUpgrade amazon-cloudwatch-agentUpgrade rclone-debuginfoUpgrade nerdctl	Jun 9, 2026	May 22, 2026
Redhat_linux	—	No solution exists	Oct 16, 2026	May 22, 2026
Ubuntu	—	Upgrade google-guest-agent (Ubuntu Pro)Upgrade golang-go.crypto-dev (Ubuntu Pro)Upgrade google-guest-agentUpgrade golang-golang-x-crypto-dev (Ubuntu Pro)Upgrade lxd (Ubuntu Pro)	Jun 18, 2026	Jun 17, 2026

Prioritise with Active Threat Intelligence

With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.

Explore Intelligence Hub

MDR Buyer's Guide

Global Threat Landscape Report

Grow your business

CVSS Details

Covered by Rapid7

Prioritise with Active Threat Intelligence