CVE-2026-39827: An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server…

PriorityP433medium6.5CVSS 3.1

AVNACLPRLUINSUCNINAH

EPSS

0.20%

9.5th percentile

An authenticated SSH client that repeatedly opened channels which were rejected by the server caused unbounded memory growth, eventually crashing the server process and affecting all connected users. Rejected channels are now properly removed from the connection's internal state and released for garbage collection.

Affected

3 ranges

Vendor	Product	Version range	Fixed in
golang.org	x_crypto_golang.org_x_crypto_ssh	< 0.52.0	0.52.0
golang.org	x_crypto_ssh	>= 0 < 0.52.0	0.52.0
golang	crypto	< 0.52.0	0.52.0

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