CVE-2026-39834
Invoking infinite loop on large channel writes in golang.org/x/crypto/ssh
Vexday Risk Score
28Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 9.1EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
22 May 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Affected products
golang.org/x/crypto · golang.org/x/crypto/sshWant to know if your infrastructure is exposed to this?
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