{"id":"CVE-2026-107909","title":"A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and pos…","summary":"A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and pos…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H","cwe":["CWE-787"],"published":"2026-10-09","updated":"2026-10-09","sourceUpdated":"2026-10-09T06:17:12.413","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107909","references":[{"url":"https://github.com/FalkorDB/FalkorDB/commit/0b11a00b34b25c4d4fdfe55f0a35c8a00593bd7d","label":"33c584b5-0579-4c06-b2a0-8d8329fcab9c"},{"url":"https://github.com/FalkorDB/FalkorDB/pull/2170","label":"33c584b5-0579-4c06-b2a0-8d8329fcab9c"},{"url":"https://github.com/FalkorDB/FalkorDB/releases/tag/v4.20.0","label":"33c584b5-0579-4c06-b2a0-8d8329fcab9c"}],"tags":["nvd"],"ingestedAt":"2026-10-09T06:27:05.589Z","slug":"CVE-2026-107909","body":"## Overview\n\nA heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly corrupt heap memory by sending a WebSocket frame with a 64-bit extended payload length to the Bolt port. The payload length is not bounded, and the only bounds check in buffer_apply_mask is an ASSERT(), which is compiled out in release builds, so the function XORs memory beyond the end of the receive buffer with the attacker-supplied mask key. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}