CVE-2026-84700

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.

CVSS v3 8.6 HIGH

8.6^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/OpenAtomFoundation/pikiwidb
https://github.com/OpenAtomFoundation/pikiwidb/blob/v3.5.7/src/pika_repl_server_conn.cc
https://github.com/OpenAtomFoundation/pikiwidb/issues/3270
https://www.vulncheck.com/advisories/pika-unauthenticated-replication-access-via-internal-protobuf-port

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-02 01:17

Updated : 2026-09-02 16:17

NVD link : CVE-2026-84700

Mitre link : CVE-2026-84700

CVE.ORG link : CVE-2026-84700

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

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