CVE-2026-30785 PUBLISHED

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'), Use of Password Hash With Insufficient Computational Effort vulnerability in rustdesk-client RustDesk Client rustdesk, hbb_common on Windows, MacOS, Linux (Password security module, config encryption, machine UID modules) allows Retrieve Embedded Sensitive Data. This vulnerability is associated with program files hbb_common/src/password_security.Rs, hbb_common/src/config.Rs, hbb_common/src/lib.Rs (get_uuid), machine-uid/src/lib.Rs and program routines symmetric_crypt(), encrypt_str_or_original(), decrypt_str_or_original(), get_uuid(), get_machine_id().

This issue affects RustDesk Client: through 1.4.5.

Default — any desktop installation with permanent password or saved peers

PoC available. Trivially exploitable.

Set restrictive file permissions on TOML config files. Avoid saving peer passwords.

Use one-way hashing (Argon2id) for passwords. Use OS-native credential stores (DPAPI, Keychain, libsecret) for recoverable secrets. Apply proper KDF. Use random nonces.

• Erez Kalman finder
• Erez Kalman reporter

• https://github.com/rustdesk/rustdesk/discussions/9229
• https://github.com/rustdesk/rustdesk/discussions/4979
• https://docs.google.com/document/d/e/2PACX-1vSds6jjpd38oO_yIAyd1HYtKNUuea-I-ozAPpGhYI7QgAU-QGJ7D8a4rOZVj1vmiUXV1EcdRHf9aZAW/pub
• https://www.vulsec.org/

• CWE-257 CWE
• CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') CWE
• CWE-323 CWE
• CWE-916 Use of Password Hash With Insufficient Computational Effort CWE

• CAPEC-37 Retrieve Embedded Sensitive Data