CVE-2026-30789

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Source

https://cve.org/CVERecord?id=CVE-2026-30789

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30789.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-30789

Published

2026-03-05T15:41:51.417Z

Modified

2026-07-08T08:12:42.010887954Z

Severity

5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

RustDesk Auth Proof Uses Server-Controlled Salt/Challenge and Fast Double-SHA256, Enabling Offline Brute-Force

Details

Use of Password Hash With Insufficient Computational Effort, Improper Restriction of Excessive Authentication Attempts vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Client login, peer authentication modules) allows Password Brute Forcing.

The authentication proof is SHA256(SHA256(password + salt) + challenge), where both the salt and the challenge are generated entirely by the server with no client-side nonce, and the hash uses no slow key-derivation function. A rogue or on-path API/relay server (see CVE-2026-30794 / CVE-2026-30797) can issue a chosen salt and challenge, capture the resulting proof, and recover the password offline. The capture-replay claim (CWE-294) is withdrawn: the challenge is regenerated per connection (challenge = Config::getautopassword(6)), so a captured proof is not replayable against the legitimate server. The 1.4.7 OTP brute-force limiter and the existing LOGIN_FAILURES counter constrain only ONLINE attempts and do not address offline recovery.

This vulnerability is associated with program files src/client.rs and program routines handlehash(), handleloginfromui() (login proof construction).

This issue affects RustDesk Client: through 1.4.8.

Database specific

{
    "cna_assigner": "VULSec",
    "cwe_ids": [
        "CWE-916"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30789.json"
}

References

Affected packages

Git / github.com/rustdesk/rustdesk

Affected ranges

Type

GIT

Repo

https://github.com/rustdesk/rustdesk

Events

Introduced

Last affected

9ded8d6ab24779db3c9334f5a3d6a652b8425c4f

Database specific

{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "1.4.8"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

1.*

1.1.3

1.1.8

1.1.9

1.2.0

1.2.1

1.2.2

1.2.3

1.2.3-1

1.2.3-2

1.2.4

1.2.5

1.2.6

1.2.7

1.3.0

1.3.1

1.3.2

1.3.3

1.3.4

1.3.5

1.3.6

1.3.7

1.3.8

1.3.9

1.4.0

1.4.1

1.4.2

1.4.3

1.4.4

1.4.5

1.4.6

1.4.7

1.4.8

Other

fdroid-version

nightly

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-30789.json"