What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-15
• Weakness: CWE-125

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.

Affected products

• FalkorDB: before 4.18.4 — fixed in 4.18.4

How to fix

Upgrade to a fixed version: FalkorDB 4.18.4. Check the vendor advisory for mitigations.

References

• https://github.com/FalkorDB/FalkorDB/commit/55d986f45ecd5d80f7a9e5e138e8b0f96535b48c
• https://github.com/FalkorDB/FalkorDB/pull/1972
• https://github.com/FalkorDB/FalkorDB/releases/tag/v4.18.4

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