CVE-2026-39834

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-39834
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.

9.1 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://go.dev/cl/781663 Issue Tracking
https://go.dev/issue/79567 Issue Tracking
https://groups.google.com/g/golang-announce/c/a082jnz-LvI Mailing List
https://pkg.go.dev/vuln/GO-2026-5020 Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*
History

28 May 2026, 15:03

Type Values Removed Values Added
CWE CWE-190
References () https://go.dev/cl/781663 - () https://go.dev/cl/781663 - Issue Tracking
References () https://go.dev/issue/79567 - () https://go.dev/issue/79567 - Issue Tracking
References () https://groups.google.com/g/golang-announce/c/a082jnz-LvI - () https://groups.google.com/g/golang-announce/c/a082jnz-LvI - Mailing List
References () https://pkg.go.dev/vuln/GO-2026-5020 - () https://pkg.go.dev/vuln/GO-2026-5020 - Vendor Advisory
First Time Golang crypto
Golang
CPE cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

22 May 2026, 19:17

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.1

22 May 2026, 04:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-22 04:16

Updated : 2026-05-28 15:03

NVD link : CVE-2026-39834

Mitre link : CVE-2026-39834

CVE.ORG link : CVE-2026-39834

JSON object : View

Products Affected

golang

  • crypto
CWE
CWE-190

Integer Overflow or Wraparound