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CVE-2026-84700— Pika Unauthenticated Replication Access via Internal Protobuf Port

Quick assessment

Affected
OpenAtomFoundation pikiwidb
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PikiwiDB（Pika）v3.5.7 在客户端端口加 2000 的端口（例如，若默认客户端端口为 9221，则对应复制端口为 11221）上暴露了一个内部 protobuf 复制服务器，且该服务器对入站请求不进行身份认证。尽管 本应控制复制流程——从库在 请求中通过 字段提供该密码——但只有 处理器（ ）会校验该密码；而帧分发器（ ）在将其他消息类型路由到各自处理器之前，并不要求已完成或已尝试过 。因此，未认证的远程攻击者可以直接连接复制端口，并发送 、 、 和 请求，从而获取全量同步快照和实时写入流，并移除副

CVSS 8.6 · High

Possible ATT&CK Techniques 1 AI

T1021 · Remote Services
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I. Basic Information for CVE-2026-84700

Vulnerability Information
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Vulnerability Title
Pika Unauthenticated Replication Access via Internal Protobuf Port
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenAtomFoundation pikiwidb 0 ~ 4.0.4-alpha -

II. Public POCs for CVE-2026-84700

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III. Intelligence Information for CVE-2026-84700

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Vendor Advisories for CVE-2026-84700 (1)

Security Blog Posts for CVE-2026-84700 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-84700

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