# CVE-2026-30796: RustDesk Client Transmits Preset Address Book Password Verbatim in Heartbeat Sync

> RustDesk Client leaks the address book password in heartbeat syncs, allowing attackers with API control to access sensitive data.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Mar 2026
- **Updated:** 19 Jul 2026
- **Also known as:** GHSA-v69h-c25q-f3jf

## What is CVE-2026-30796?

CVE-2026-30796 is a medium-severity vulnerability in rustdesk-client RustDesk Client, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Cleartext Transmission of Sensitive Information, Insufficiently Protected Credentials vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (Address book sync, Heartbeat sync loop modules) allows Sniffing Attacks.

The client places the preset address-book password verbatim into the heartbeat sync JSON body (src/hbbs_http/sync.rs). Over an intact HTTPS session it is not exposed in transit, but it is a reusable shared secret rather than a zero-knowledge proof, so it is recovered by any party that becomes the API endpoint - under the re-homed/rogue API server (CVE-2026-30797) - and the leaked credential then authorizes the server-side address book.

This vulnerability is associated with program files src/hbbs_http/sync.rs and program routines heartbeat sync body builder (emits preset-address-book-password).

This issue affects RustDesk Client: through 1.4.8.

Weakness: CWE-522 (Insufficiently Protected Credentials)

## Which versions are affected by CVE-2026-30796?

It affects 1 product.


Products: Rustdesk Rustdesk Server.

## How do I fix CVE-2026-30796?

No fix has been published for CVE-2026-30796 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-30796 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30796 exists.

## Other vulnerabilities in rustdesk-client RustDesk Client

- [CVE-2026-3598](https://insights.sbomify.com/CVE-2026-3598/): RustDesk Server Generates Config Strings Using Reversible Encoding (Base64 + Reverse) Instead of Encryption (high 8.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30796 and fix it if it is affected.

What it is: CVE-2026-30796 is a medium-severity vulnerability in rustdesk-client RustDesk Client, published on 5 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30796 exists.

Affected product: rustdesk-client RustDesk Client. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-30796/ (Markdown: https://insights.sbomify.com/CVE-2026-30796/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30796
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30796
- OSV: https://osv.dev/vulnerability/CVE-2026-30796

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-30796/
Summaries are generated and may contain mistakes; the official description above is the record.