CVE-2026-107909

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 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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/FalkorDB/FalkorDB/commit/0b11a00b34b25c4d4fdfe55f0a35c8a00593bd7d
https://github.com/FalkorDB/FalkorDB/pull/2170
https://github.com/FalkorDB/FalkorDB/releases/tag/v4.20.0

Configurations

No configuration.

History

09 Oct 2026, 06:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-09 06:17

Updated : 2026-10-15 16:17

NVD link : CVE-2026-107909

Mitre link : CVE-2026-107909

CVE.ORG link : CVE-2026-107909

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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