{"id":"CVE-2026-73108","title":"RustDesk versions before 1.4.7 contain an uncontrolled speculative memory allocation vulnerability in BytesCodec","summary":"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 b…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"published":"2026-08-26","updated":"2026-08-28","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73108","references":[{"url":"https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de","label":"disclosure@vulncheck.com"},{"url":"https://github.com/rustdesk/rustdesk/commit/518296f2570d107ad416f29ade5fcce3177f4115","label":"disclosure@vulncheck.com"},{"url":"https://github.com/rustdesk/rustdesk/releases/tag/1.4.7","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodec","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00528,"epssPercentile":0.43646,"ingestedAt":"2026-08-29T21:42:34.561Z","slug":"CVE-2026-73108","body":"## Overview\n\nRustDesk 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}