{"id":"CVE-2026-73108","summary":"RustDesk \u003c 1.4.7 Uncontrolled Memory Allocation DoS via BytesCodec","details":"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.","modified":"2026-08-30T03:30:31.482033481Z","published":"2026-08-26T13:00:29.283Z","database_specific":{"cwe_ids":["CWE-770"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73108.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73108.json"},{"type":"ADVISORY","url":"https://github.com/rustdesk/rustdesk/releases/tag/1.4.7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73108"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodec"},{"type":"FIX","url":"https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de"},{"type":"FIX","url":"https://github.com/rustdesk/rustdesk/commit/518296f2570d107ad416f29ade5fcce3177f4115"},{"type":"PACKAGE","url":"https://github.com/rustdesk/rustdesk"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/rustdesk/hbb_common","events":[{"introduced":"0"},{"fixed":"547da54b4ee58eed47163fbd47edb4639e3d88de"}],"database_specific":{"source":"REFERENCES"}},{"type":"GIT","repo":"https://github.com/rustdesk/rustdesk","events":[{"introduced":"0"},{"fixed":"0c86d4616298f09435f6236599b300964aa61460"},{"fixed":"518296f2570d107ad416f29ade5fcce3177f4115"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.4.7"}],"source":["DESCRIPTION","REFERENCES"]}}],"versions":["driver","dirver","1.4.6","nightly","1.4.5","1.4.4","1.4.3","1.4.2","1.4.1","1.4.0","1.3.9","1.3.8","1.3.7","1.3.6","1.3.5","1.3.4","1.3.3","1.3.2","1.3.1","1.3.0","1.2.7","1.2.6","1.2.5","fdroid-version","1.2.4","1.2.3-2","1.2.3-1","1.2.3","1.2.2","1.2.1","1.2.0","1.1.9","1.1.8","1.1.3"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73108.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}