UBUNTU-CVE-2026-73429

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-73429
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73429.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-73429
Upstream
Published
2026-08-12T21:17:00Z
Modified
2026-10-17T13:01:02Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:26.10 / rust-russh

Package

Name
rust-russh
Purl
pkg:deb/ubuntu/rust-russh?arch=source&distro=stonking

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.57.1-2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "librust-russh-dev",
            "binary_version":  "0.57.1-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-73429.json"