CVE-2026-39834
Published:May 22, 2026
Updated:May 29, 2026
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.
Affected Packages
https://github.com/golang/crypto.git (GITHUB):
Affected version(s) >=v0.1.0 <v0.52.0Fix Suggestion:
Update to version v0.52.0golang.org/x/crypto (GO):
Affected version(s) >=v0.0.0-20120125194513-f61fbb80d2fc <v0.52.0Fix Suggestion:
Update to version v0.52.0Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Integer Overflow or Wraparound
EPSS
Base Score:
0.05