Resource exhaustion in Rustdesk
CVE-2026-73108
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.008 (54.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.008 · change: +0.002
Affected products
Weakness classification (CWE)
References
- RustDesk 1.4.7 Release Notes (release-notes)
- hbb_common Patch Commit (patch)
- RustDesk Patch Commit (patch)
- www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-by… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-73108?
- CVE-2026-73108 is a high-severity vulnerability in Rustdesk, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-08-26.
- How severe is CVE-2026-73108?
- High severity. CVSS v3 base score is 7.5 out of 10.