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CVE-2026-39834

OpenSSH

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 9.1EPSS 0.525%Risk 0.95
View source
Published
2026-05-22 04:16:24
Affected versions
unknown
Type
Critical software
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H