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CVE-2026-7826— Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB

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 4.18.4 版本之前，BufferSerializerIOv2_ReadBuffer 函数（位于 src/serializers/serializer_io.c）中存在一个基于堆的越界读取漏洞。远程攻击者如果能够发送 Redis 复制命令（例如，针对未配置密码的实例），可以通过提供经过精心构造的 RDB 数据流来触发该漏洞，其中子缓冲区长度字段超过了剩余缓冲区的大小，从而导致拒绝服务或堆内存信息泄露。唯一的边界检查是一个 ASSERT() 宏，在发布构建版本中会被编译掉，因此 memcpy(

CVSS 9.1 · Critical
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I. Basic Information for CVE-2026-7826

Vulnerability Information
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Vulnerability Title
Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
Source: CVE Program / CVE List V5
Vulnerability Description
A heap-based out-of-bounds read in the BufferSerializerIOv2_ReadBuffer function (src/serializers/serializer_io.c) in FalkorDB before 4.18.4 allows a remote attacker who can issue Redis replication commands (for example, against an instance with no password configured) to cause a denial of service or disclose heap memory by supplying a crafted RDB stream whose sub-buffer length field exceeds the remaining buffer size. The only bounds check is an ASSERT(), which is compiled out in release builds, so memcpy() reads past the end of the heap allocation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FalkorDB FalkorDB 0 ~ 4.18.4 cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-7826

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III. Intelligence Information for CVE-2026-7826

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Other References for CVE-2026-7826 (3)

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-2026-107909 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-125

V. Comments for CVE-2026-7826

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