CVE-2026-84700: Missing Authentication for Critical Function in OpenAtomFoundation pikiwidb
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.
CVSS v4.0
Score 8.8high
Affected software
OpenAtomFoundation
pikiwidb
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PikiwiDB (Pika) v4.0.4-alpha exposes an internal protobuf replication server on a port derived from the client port plus 2000 that lacks comprehensive authentication. The requirepass setting is only enforced by the MetaSync handler, but the frame dispatcher routes other message types without requiring authentication. Consequently, an unauthenticated remote attacker can connect to the replication port and issue commands such as TrySync, DBSync, BinlogSync, and RemoveSlaveNode. This allows the attacker to obtain replication data and disrupt replica nodes despite requirepass being set.
Potential Impact
An unauthenticated remote attacker can connect to the replication server and perform replication-related operations without authorization. This includes obtaining full-sync snapshots and live write streams, potentially exposing sensitive data. Additionally, the attacker can remove replica nodes, disrupting replication and availability. The vulnerability undermines the intended access control provided by requirepass, leading to high confidentiality and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict network access to the replication port to trusted hosts only to prevent unauthorized connections. Monitor for unusual replication activity and consider disabling replication if feasible until the vulnerability is addressed.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-01T23:24:28.318Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a977a61acd9273b49923c36
Added to database: 09/02/2026, 01:22:41 UTC
Last enriched: 09/07/2026, 13:46:26 UTC
Last updated: 10/16/2026, 18:48:25 UTC
Views: 109
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