VULNERABILITY INTELLIGENCE

CVE-2026-39834

CVSS score9.1 CRITICAL
EPSS probability0.60%
CISA KEVNot currently listed
Published2026-05-22
Last modified2026-07-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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.

Weakness classification

  • nvd@nist.gov: CWE-190

Primary references