CVE-2026-30794 PUBLISHED

RustDesk HTTP Client Silently Accepts Invalid TLS Certificates After Handshake Failure

Assigner: VULSec
Reserved: 05.03.2026 Published: 05.03.2026 Updated: 05.03.2026

Improper Certificate Validation vulnerability in rustdesk-client RustDesk Client rustdesk-client on Windows, MacOS, Linux, iOS, Android (HTTP API client, TLS transport modules) allows Adversary in the Middle (AiTM). This vulnerability is associated with program files src/hbbs_http/http_client.Rs and program routines TLS retry with danger_accept_invalid_certs(true).

This issue affects RustDesk Client: through 1.4.5.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS Score: 9.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	None	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	rustdesk-client
Product	RustDesk Client
Versions	Default: affected affected from 0 to 1.4.5 (incl.)

Affected Configurations

Default — any client connecting to API server via HTTPS

Exploits

PoC available. Trivially exploitable.

Workarounds

Ensure network path to API server cannot be intercepted (VPN, direct link)

Solutions

Remove automatic fallback. Treat TLS handshake failures as fatal.

Credits

Erez Kalman finder
Erez Kalman reporter

References

https://github.com/rustdesk/rustdesk

Problem Types

CWE-295 Improper Certificate Validation CWE

Impacts

CAPEC-94 Adversary in the Middle (AiTM)