CVE-2026-73108
RustDesk < 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec
- State
- Published
- Severity
- 8.7 High
- Published
- Aug 26, 2026
- Updated
- Oct 1, 2026
- Reserved
- Aug 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
rustdeskrustdesk |
|
References
- RustDesk 1.4.7 Release Notesrelease-notes
- hbb_common Patch Commitpatch
- RustDesk Patch Commitpatch
- https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodecthird-party-advisory
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