# CVE-2026-30794: RustDesk Client improper certificate validation in TLS transport modules

Source: https://junglewise.ai/threats/cve-2026-30794-rustdesk-client-improper-certificate-validation-in-tls-transport  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-05. Updated: 2026-06-22  
License: CC BY 4.0 with a link back

CVE-2026-30794 · Severity: high · CVSS 8.1 · Published 2026-03-05

RustDesk Client, a remote desktop application, contains a security flaw in how it handles encrypted connections. If a secure connection fails, the software automatically retries using an insecure mode that ignores certificate errors. This allows an attacker positioned on the network to intercept sensitive data, harvest credentials, or inject malicious configuration settings without the user's knowledge.

Technologies: [Apple Iphone Os](https://junglewise.ai/threats/technologies/iphone-os), [Apple macOS](https://junglewise.ai/threats/technologies/macos), [Google Android](https://junglewise.ai/threats/technologies/android), [Linux Kernel](https://junglewise.ai/threats/technologies/kernel), [Microsoft Windows](https://junglewise.ai/threats/technologies/windows), [Rustdesk](https://junglewise.ai/threats/technologies/rustdesk), [RustDesk Client](https://junglewise.ai/threats/technologies/rustdesk-client). Vendors: [Apple](https://junglewise.ai/threats/vendors/apple), [Google](https://junglewise.ai/threats/vendors/google), [Linux](https://junglewise.ai/threats/vendors/linux), [Microsoft](https://junglewise.ai/threats/vendors/microsoft), [Rustdesk](https://junglewise.ai/threats/vendors/rustdesk).

## Quick answers

**Is CVE-2026-30794 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-30794 being exploited in the wild.

**How severe is CVE-2026-30794?** High severity, with a CVSS score of 8.1, published 5 March 2026.

**Which products and versions are affected?** RustDesk Client through 1.4.8.

**Is there a fix for CVE-2026-30794?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-30794 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-30794?** Check whether you run Apple Iphone Os, Apple macOS, Google Android or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An Improper Certificate Validation vulnerability exists in the RustDesk Client (up to version 1.4.8) within the HTTP API client and TLS transport modules. The root cause is located in `src/hbbs_http/http_client.rs`, where the application is configured to automatically retry failed TLS handshakes using the `danger_accept_invalid_certs(true)` routine. This fallback mechanism allows a network-positioned attacker to perform an Adversary-in-the-Middle (AiTM) attack. Successful exploitation enables the interception of plaintext credentials (such as address book secrets) and the injection of rogue strategy payloads to override local security policies.

## Affected products

- RustDesk RustDesk Client through 1.4.8

## Timeline

- 2026-03-05: disclosed: Initial vulnerability discovery and TLP:GREEN report published by VULSec Labs.
- 2026-03-05: advisory
- 2026-06-22: other: Advisory updated to confirm the vulnerability persists in version 1.4.8.

## References

- [https://github.com/rustdesk/rustdesk/releases](https://github.com/rustdesk/rustdesk/releases)
- [https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub](https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub)
- [https://github.com/rustdesk/rustdesk](https://github.com/rustdesk/rustdesk)
- [https://www.vulsec.org/](https://www.vulsec.org/)

## Related threats

- [Google Android Bluetooth buffer overflow in acquireMemory](https://junglewise.ai/threats/cve-2026-95405-in-acquirememory-of-bt-bqr-offload-cc-there-is-a-possible-way-to)
- [ST NFC HAL out-of-bounds write in global memory](https://junglewise.ai/threats/cve-2026-95400-in-stnfc-hal-write-of-hal-st21nfc-cc-there-is-a-possible-way-to)
- [Android HEVC decoder buffer overflow in sub_layer_hrd_parameters](https://junglewise.ai/threats/cve-2026-95397-in-sub-layer-hrd-parameters-of-hevc-decoder-there-is-a-possible)
- [Android framework memory exhaustion in message queue handling](https://junglewise.ai/threats/cve-2026-59632-in-respondreceivedmessage-of-mtsmessagecontroller-cpp-there-is-a)
- [Android use-after-free in UssiController connection listener](https://junglewise.ai/threats/cve-2026-59626-in-sendinfo-of-ussicontroller-cpp-there-is-a-possible-way-to)