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CVE-2026-107909— Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via unbounded payload length

Quick assessment

Affected
FalkorDB FalkorDB
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 FalkorDB 4.20.0 版本之前， 中的 函数以及 中的 函数存在一个基于堆的越界写入漏洞。远程未认证攻击者可以通过向 Bolt 端口发送一个带有 64 位扩展负载长度的 WebSocket 帧，导致服务拒绝（DoS）并可能破坏堆内存。 负载长度未受到限制，而 中唯一的边界检查是一个 宏，该宏在发布版本（release builds）中会被编译移除。因此，该函数会将接收缓冲区末尾之外的内存与攻击者提供的掩码密钥进行 XOR 运算。只有启用了 Bolt 端口的部署实例（默认情况下 是禁用的）会受到此漏洞影

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-107909

Vulnerability Information
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Vulnerability Title
Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via unbounded payload length
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FalkorDB FalkorDB 0 ~ 4.20.0 cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-107909

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III. Intelligence Information for CVE-2026-107909

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Patches & Fixes for CVE-2026-107909 (1)

Vendor Pages for CVE-2026-107909 (1)

Same Patch Batch · FalkorDB · 2026-10-09 · 7 CVEs total

CVE-2026-5759 9.8 CRITICAL Double free and use-after-free in FalkorDB RdbLoadDeletedNodes allows remote code executio
CVE-2026-107908 9.8 CRITICAL Pre-authentication heap out-of-bounds write in FalkorDB Bolt BoltReadHandler via RESET mes
CVE-2026-7826 9.1 CRITICAL Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
CVE-2026-7827 8.1 HIGH Stack-based buffer overflow in FalkorDB _RdbLoadEntity via unbounded property count in cra
CVE-2026-107910 8.1 HIGH Authentication bypass in FalkorDB Bolt endpoint via fail-open AUTH probe error handling
CVE-2026-107911 7.5 HIGH Type confusion in FalkorDB GRAPH.QUERY via the --bolt argument

IV. Related Vulnerabilities

Same product: FalkorDB
Same vendor: FalkorDB
Same weakness: CWE-787

V. Comments for CVE-2026-107909

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