1. Home
  2. CVE Database
  3. CVE-2026-39834
CRITICAL · 9.1

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 packe...

Vulnerability 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.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
GolangCrypto< 0.52.0

Related Weaknesses (CWE)

CWE-190

References

FAQ

What is CVE-2026-39834?

CVE-2026-39834 is a vulnerability with a CVSS score of 9.1 (CRITICAL). 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 packe...

How severe is CVE-2026-39834?

CVE-2026-39834 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-39834?

Check the references section above for vendor advisories and patch information. Affected products include: Golang Crypto.