CVE-2026-116696

Low

Description

russh is a Rust SSH client and server library that includes an SSH agent protocol implementation. Prior to 0.65.0, russh::keys::agent::server::serve in russh/src/keys/agent/server.rs accepts repeated SSH_AGENT_CONSTRAIN_CONFIRM records while adding a key and appends every Constraint::Confirm record to the key's retained constraint vector without a count or memory limit. A process that can connect to the agent socket, including the remote side of a forwarded agent session, can repeatedly add constrained keys and cause renewable memory growth that persists for the process lifetime because keys without a lifetime constraint do not expire. This issue is fixed in version 0.65.0.

SeverityLow

CVSS3.3

Exploit probability—

ProductRussh

PublishedOct 27, 2026

First seenOct 27, 2026

Weakness typeCWE-770Allocation of resources without limits

How to fix

Update

russh0.65.0 or later

Affected products

Product	Affected versions	Fixed in
russhcrates.io	v < 0.65.0	0.65.0

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