{"id":"CVE-2026-73108","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-73108","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…","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.","published":"2026-08-26T14:17:12.830","modified":"2026-08-26T14:17:12.830","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de","label":"rustdesk/hbb_common@547da54"},"references":[{"type":"WEB","url":"https://github.com/rustdesk/hbb_common/commit/547da54b4ee58eed47163fbd47edb4639e3d88de"},{"type":"WEB","url":"https://github.com/rustdesk/rustdesk/commit/518296f2570d107ad416f29ade5fcce3177f4115"},{"type":"WEB","url":"https://github.com/rustdesk/rustdesk/releases/tag/1.4.7"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/rustdesk-uncontrolled-memory-allocation-dos-via-bytescodec"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-26T14:17:12.830"}}