CVE-2026-7826 Heap out-of-bounds read in FalkorDB BufferSerializerIOv2_ReadBuffer via crafted RDB
Remote attackers can read heap memory or crash FalkorDB by sending crafted RDB streams via replication commands, affecting instances without passwords.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-7826?
CVE-2026-7826 is a high-severity vulnerability in FalkorDB, published on 9 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-7826?
How do I fix CVE-2026-7826?
No fix has been published for CVE-2026-7826 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-7826 being exploited?
There is no known exploitation of CVE-2026-7826 in the wild and no public exploit code.
Sources
Also known as GHSA-fmqx-854h-cfff.