FalkorDB up to 4.18.3 RDB serializer_io.c BufferSerializerIOv2_ReadBuffer out-of-bounds

Summaryinfo

A vulnerability labeled as critical has been found in FalkorDB up to 4.18.3. Affected by this vulnerability is the function BufferSerializerIOv2_ReadBuffer of the file src/serializers/serializer_io.c of the component RDB Handler. Such manipulation leads to out-of-bounds. This vulnerability is uniquely identified as CVE-2026-7826. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in FalkorDB up to 4.18.3. Affected by this issue is the function BufferSerializerIOv2_ReadBuffer of the file src/serializers/serializer_io.c of the component RDB Handler. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-7826 since 05/05/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 4.18.4 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-95475). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• FalkorDB

Version

• 4.18.0
• 4.18.1
• 4.18.2
• 4.18.3

Website

• Product: https://github.com/FalkorDB/FalkorDB/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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