Vulnerability · Published Oct 9, 2026 · Assigned by securin

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

Critical 9.1

In plain English

A critical-severity out-of-bounds read in FalkorDB from FalkorDB. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.4%top 62.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
FalkorDB	FalkorDB	0 – before 4.18.4

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

FalkorDB PR #1972 patch
Fix commit patch
FalkorDB 4.18.4 release notes release-notes