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CVE-2026-48106— Arc Enterprise cluster replication accepts unauthenticated MsgReplicateSync messages, enabling cluster-wide data injection from any TLS-trusted peer

Quick assessment

Affected
Basekick-Labs arc
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arc 是一款面向遥测数据的开源、原生 SQL 时间序列数据库。在 26.06.1 版本之前，Arc Enterprise 的集群复制接收器（位于 ）仅对入站消息的协议格式信封（如长度、操作码）进行验证。 负载本身在应用层未经任何身份认证即被接受——缺乏 HMAC 签名、消息签名或每消息nonce（一次性随机数）。虽然复制流通过传输层 TLS/mTLS 得到保护，但在对等节点加入集群网络后，应用层消息篡改或重放攻击仍缺乏防护。该问题已在 26.06.1 版本中修复。目前可采用以下临时缓解措施：通过严格的防火墙规则将

CVSS 8.3 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Basekick-Labs arc < 2026.06.1 affected
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I. Basic Information for CVE-2026-48106

Vulnerability Information
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Vulnerability Title
Arc Enterprise cluster replication accepts unauthenticated MsgReplicateSync messages, enabling cluster-wide data injection from any TLS-trusted peer
Source: CVE Program / CVE List V5
Vulnerability Description
Arc is an open, SQL-native time-series database for telemetry. Prior to version 26.06.1, Arc Enterprise's cluster replication receiver at `internal/cluster/replication/receiver.go` validates only the wire-format envelope (length, opcode) of inbound messages. The `MsgReplicateSync` payload itself is accepted without any application-layer authentication — no HMAC, no signature, no per-message nonce. The replication stream is protected at the transport layer by TLS / mTLS, but there is no protection against application-layer message tampering or replay once a peer is on the cluster network. This is fixed in 2026.06.1. Some workarounds are available. Restrict cluster network access to known-trusted peers via strict firewall rules, audit replication logs for unexpected `MsgReplicateSync` traffic, and/or disable cluster mode until the fix is available.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N
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
Basekick-Labs arc < 2026.06.1 -

II. Public POCs for CVE-2026-48106

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9185 chars
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III. Intelligence Information for CVE-2026-48106

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Vendor Advisories for CVE-2026-48106 (1)

Same Patch Batch · Basekick-Labs · 2026-08-21 · 4 CVEs total

CVE-2026-48050 8.8 HIGH Arc: Unauthenticated access to Go debug pprof endpoints leaks runtime state and enables CP
CVE-2026-48105 8.3 HIGH Arc Enterprise cluster FSM applyRegisterFile accepts arbitrary file paths without validati
CVE-2026-47735 7.1 HIGH Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses

IV. Related Vulnerabilities

Same product: arc
Same vendor: Basekick-Labs
Same weakness: CWE-306

V. Comments for CVE-2026-48106

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