[From nobody Wed Oct  7 00:37:07 2026
Received: (at submit) by bugs.debian.org; 14 Aug 2026 07:03:54 +0000
X-Spam-Checker-Version: SpamAssassin 4.0.1-bugs.debian.org_2005_01_02
 (2024-03-25) on buxtehude.debian.org
X-Spam-Level: 
X-Spam-Status: No, score=-10.0 required=4.0 tests=BAYES_00,FROMDEVELOPER,
 NO_RELAYS,XMAILER_REPORTBUG autolearn=ham autolearn_force=no
 version=4.0.1-bugs.debian.org_2005_01_02
X-Spam-Bayes: score:0.0000 Tokens: new, 30; hammy, 150; neutral, 66; spammy,
 0. spammytokens: hammytokens:0.000-+--XDebbugsCc,
 0.000-+--X-Debbugs-Cc, 0.000-+--H*F:U*carnil, 0.000-+--H*Ad:N*Bug,
 0.000-+--HTo:N*Debian
Return-path: <carnil@debian.org>
Received: via submission by buxtehude.debian.org with esmtp (Exim 4.96)
 (envelope-from <carnil@debian.org>) id 1wulxI-0028wq-33
 for submit@bugs.debian.org; Fri, 14 Aug 2026 07:03:54 +0000
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: rust-russh: CVE-2026-73429 CVE-2026-73430
Message-ID: <178669103198.1041613.9733817919052688355.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Fri, 14 Aug 2026 09:03:51 +0200
Delivered-To: submit@bugs.debian.org

Source: rust-russh
Version: 0.57.1-2
Severity: grave
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerabilities were published for rust-russh.

CVE-2026-73429[0]:
| Russh is a Rust SSH client & server library. Prior to 0.62.4, a
| malicious SSH server can crash a russh client session with a
| malformed KEX_ECDH_REPLY containing a server ephemeral value that is
| not 32 bytes long. The client-side
| Curve25519Kex::compute_shared_secret function in
| russh/src/kex/curve25519.rs passes the decoded
| exchange.server_ephemeral value to clone_from_slice without
| validating its length, causing a deterministic panic before the
| server host key is verified. The panic terminates the spawned client
| session task and surfaces as a JoinError, while the embedding
| process normally remains running. This issue is fixed in version
| 0.62.4.


CVE-2026-73430[1]:
| Russh is a Rust SSH client & server library. Prior to 0.62.4, an
| unauthenticated SSH client can cause a denial of service by sending
| SSH_MSG_KEX_ECDH_INIT with a 32-byte all-zero Q_C value.
| Curve25519Kex::server_dh in russh/src/kex/curve25519.rs accepts the
| all-zero peer public value and computes an all-zero shared secret,
| after which compute_exchange_hash calls encode_mpint in
| russh/src/kex/mod.rs and indexes beyond the end of the input while
| skipping leading zero bytes. The resulting panic occurs before
| authentication and terminates the server key-exchange task. This
| issue is fixed in version 0.62.4.


If you fix the vulnerabilities please also make sure to include the
CVE (Common Vulnerabilities & Exposures) ids in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-73429
    https://www.cve.org/CVERecord?id=CVE-2026-73429
[1] https://security-tracker.debian.org/tracker/CVE-2026-73430
    https://www.cve.org/CVERecord?id=CVE-2026-73430

Regards,
Salvatore
]