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CVE-2026-107908— Pre-authentication heap out-of-bounds write in FalkorDB Bolt BoltReadHandler via RESET message

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， 文件中的 函数存在一个基于堆的越界写入漏洞。远程未认证的攻击者通过向 Bolt 端口发送包含攻击者自定义 chunk 大小的 Bolt RESET 消息，可导致拒绝服务（DoS），并可能执行任意代码。 该处理程序仅使用 宏对 chunk 大小进行检查，而 在发布版本（release builds）中会被编译移除。随后，该函数根据从网络传入的 16 位 size 字段计算目标指针，并将缓冲数据最多向前（向低地址方向）移动约 64 KiB，超出读取缓冲区的起始位置，从而引

CVSS 9.8 · Critical
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I. Basic Information for CVE-2026-107908

Vulnerability Information
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Vulnerability Title
Pre-authentication heap out-of-bounds write in FalkorDB Bolt BoltReadHandler via RESET message
Source: CVE Program / CVE List V5
Vulnerability Description
A heap-based out-of-bounds write in the BoltReadHandler function (src/bolt/bolt_api.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly execute arbitrary code by sending a Bolt RESET message with an attacker-chosen chunk size to the Bolt port. The handler checks the size only with ASSERT(), which is compiled out in release builds, then computes a destination pointer from the wire-supplied 16-bit size and moves buffered data up to about 64 KiB backwards past the start of the read buffer. 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:H/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-2026-107908

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III. Intelligence Information for CVE-2026-107908

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Patches & Fixes for CVE-2026-107908 (1)

Vendor Pages for CVE-2026-107908 (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-2026-7826 9.1 CRITICAL Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
CVE-2026-107909 9.1 CRITICAL Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via
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-2026-107908

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