CVE-2026-102821
mediumRussh is a Rust SSH client and server library.
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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/Eugeny/russh/commit/a282af361ac99bc76b80876d1aae128e89dbf66b security-advisories@github.com
- https://github.com/Eugeny/russh/releases/tag/v0.63.2 security-advisories@github.com
- https://github.com/Eugeny/russh/security/advisories/GHSA-35g8-35p8-c8fw security-advisories@github.com
- https://github.com/Eugeny/russh/security/advisories/GHSA-35g8-35p8-c8fw 134c704f-9b21-4f2e-91b3-4a467353bcc0