RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec. (CVE-2026-73108)
Description
RustDesk versions prior to 1.4.7 have a vulnerability in BytesCodec where the decoder speculatively allocates memory based on a length field in a frame header before authentication. This allows an attacker to request large memory allocations, potentially exhausting system memory and causing denial of service. The issue is fixed in version 1.4.7 by capping the speculative preallocation to 256 KiB.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
RustDesk before version 1.4.7 contains an uncontrolled speculative memory allocation vulnerability (CVE-2026-73108) in the BytesCodec component. The decoder trusts the payload length encoded in a four-byte frame header before authentication and reserves that amount of memory. An attacker can craft a header requesting up to 1,073,741,823 bytes, leading to memory exhaustion and denial of service via concurrent TCP connections. The vulnerability is addressed by limiting the header-triggered speculative preallocation to 256 KiB in version 1.4.7.
Potential Impact
An unauthenticated attacker can exploit this vulnerability to cause memory exhaustion on the affected system, resulting in denial of service. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade RustDesk to version 1.4.7 or later, where the vulnerability is fixed by capping speculative memory allocation. No other mitigations are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-qfp6-8rww-vh6v
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-73108"]
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a92f7e0acd9273b49e75bce
Added to database: 08/29/2026, 15:16:48 UTC
Last enriched: 09/08/2026, 02:07:31 UTC
Last updated: 10/11/2026, 18:48:21 UTC
Views: 26
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