CVE-2026-73108 RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec
Unauthenticated attackers can cause denial of service in RustDesk by sending crafted headers that trigger excessive memory allocation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73108?
CVE-2026-73108 is a high-severity denial of service vulnerability in rustdesk, published on 26 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-770
Which versions are affected by CVE-2026-73108?
How do I fix CVE-2026-73108?
No fix has been published for CVE-2026-73108 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-73108 being exploited?
There is no known exploitation of CVE-2026-73108 in the wild and no public exploit code.
Sources
Also known as GHSA-qfp6-8rww-vh6v.