CVE-2026-73430

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Source
https://cve.org/CVERecord?id=CVE-2026-73430
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73430.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-73430
Aliases
Downstream
Published
2026-08-12T20:55:38Z
Modified
2026-09-11T03:48:36Z
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
Summary
Russh: Pre-auth remote panic via all-zero Curve25519 peer public value (encode_mpint OOB)
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-754"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73430.json"
}
References

Affected packages

Git / github.com/eugeny/russh

Affected ranges

Type
GIT
Repo
https://github.com/eugeny/russh
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
a7fc1eb5717264e31c3c5f7dd849b73989a08f3d
Fixed
0089c89c94753bebbec12b956c07a1cd38740379
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.62.4"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.37.0-beta.1
v0.*
v0.34.0
v0.35.0-beta.1
v0.35.0-beta.2
v0.35.0-beta.3
v0.35.0-beta.5
v0.35.0-beta.6
v0.35.0-beta.7
v0.35.0-beta.8
v0.35.0-beta.9
v0.36.1
v0.37.0
v0.37.0-beta.1
v0.37.1
v0.38.0
v0.38.0-beta.1
v0.39.0-beta.1
v0.40.0
v0.40.1
v0.40.2
v0.42.0
v0.43.0
v0.43.0-beta.1
v0.44.0
v0.44.0-beta.1
v0.44.0-beta.3
v0.44.0-beta.4
v0.45.0
v0.46.0
v0.47.0-beta.3
v0.47.0-beta.4
v0.48.0
v0.48.1
v0.48.2
v0.49.0
v0.50.0
v0.50.0-beta.10
v0.50.0-beta.11
v0.50.0-beta.12
v0.50.0-beta.2
v0.50.0-beta.3
v0.50.0-beta.4
v0.50.0-beta.5
v0.50.0-beta.6
v0.50.0-beta.7
v0.50.0-beta.8
v0.50.0-beta.9
v0.50.1
v0.50.3
v0.50.4
v0.51.0
v0.51.0-beta.1
v0.51.0-beta.2
v0.51.0-beta.3
v0.51.1
v0.52.0
v0.52.0-beta.1
v0.52.1
v0.53.0
v0.53.0-beta.1
v0.54.0
v0.54.1
v0.54.2
v0.54.3
v0.54.4
v0.54.5
v0.54.6
v0.55.0
v0.56.0
v0.57.0
v0.57.1
v0.58.0
v0.59.0
v0.60.0
v0.60.1
v0.60.2
v0.60.3
v0.61.0
v0.61.1
v0.61.2
v0.62.0
v0.62.1
v0.62.2
v0.62.3

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73430.json"