What’s Vulnerable › Vulnerabilities

CVE-2026-73108: RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-26 · updated 2026-09-23
• Weakness: CWE-770

Description

RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec. Before authentication, the decoder trusts the payload length encoded in a four-byte frame header and reserves that amount before receiving the payload. A crafted header can request up to 1,073,741,823 bytes of capacity, allowing unauthenticated attackers to use concurrent TCP connections to cause memory exhaustion and denial of service. The fix caps header-triggered speculative preallocation at 256 KiB.

Affected products

• rustdesk-client RustDesk Client: before 1.4.7 — fixed in 1.4.7

How to fix

Upgrade to a fixed version: rustdesk-client RustDesk Client 1.4.7. Check the vendor advisory for mitigations.

References

• https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de
• https://github.com/rustdesk/rustdesk/commit/518296f2570d107ad416f29ade5fcce3177f4115
• https://github.com/rustdesk/rustdesk/releases/tag/1.4.7
• https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodec

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