CVE-2026-102821: CWE-400: Uncontrolled Resource Consumption in Eugeny russh
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.
CVE-2026-102821: CWE-400: Uncontrolled Resource Consumption in Eugeny russh
Description
Russh is a Rust SSH client and server library. Prior to 0.63.2, an authenticated remote peer can send SSH_MSG_KEXINIT without the required SSH_MSG_KEX_ECDH_INIT and then flood SSH_MSG_CHANNEL_OPEN messages while SessionKexState::InProgress prevents priority_receiver in russh/src/server/session.rs from being drained. The server continues processing network input and enqueues a ChannelOpenReply for each request on an unbounded channel, allowing one connection to grow memory until the process is terminated. This issue is fixed in version 0.63.2.
CVSS v3.1
Score 6.5medium
Affected software
Eugeny
russh
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-29T17:25:25.265Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abc0552680226ef681dfaf2
Added to database: 09/29/2026, 18:37:06 UTC
Last updated: 09/29/2026, 18:37:06 UTC
Views: 1
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