CVE-2026-39834

9.1 CRITICAL
Published: May 22, 2026 Modified: May 28, 2026
View on NVD

Description

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.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

Login to generate AI explanation

CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://go.dev/cl/781663
Source: security@golang.org
Issue Tracking
https://go.dev/issue/79567
Source: security@golang.org
Issue Tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
Source: security@golang.org
Mailing List
https://pkg.go.dev/vuln/GO-2026-5020
Source: security@golang.org
Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.1 / 10.0
EPSS (Exploit Probability)
0.1%
17th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

golang