CVE-2026-84700 Pika Unauthenticated Replication Access via Internal Protobuf Port
Unauthenticated attackers can access the internal replication port to read full database snapshots and modify replica nodes, bypassing configured authentication.
- 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-2026-84700?
CVE-2026-84700 is a high-severity missing authorization vulnerability in OpenAtomFoundation pikiwidb, published on 2 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
PikiwiDB (Pika) v3.5.7 exposes an internal protobuf replication server on a port derived from the client port plus 2000 (e.g. 11221 when the default client port 9221 is used) that does not authenticate incoming requests. Although requirepass is intended to gate replication — a slave presents it as masterauth inside its MetaSync request — only the MetaSync handler (HandleMetaSyncRequest) validates it; the frame dispatcher (DealMessage) does not require a completed or attempted MetaSync before routing other message types to their handlers. As a result, an unauthenticated remote attacker can connect directly to the replication port and issue TrySync, DBSync, BinlogSync, and RemoveSlaveNode requests, obtaining the full-sync snapshot and live write stream and removing replica nodes, even when requirepass is configured.
Weakness: CWE-306
Which versions are affected by CVE-2026-84700?
How do I fix CVE-2026-84700?
No fix has been published for CVE-2026-84700 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84700 being exploited?
There is no known exploitation of CVE-2026-84700 in the wild and no public exploit code.
Sources
Also known as GHSA-747h-6gh8-p8v2.