# CVE-2026-48106

## Summary

- **CVE ID:** CVE-2026-48106
- **Severity:** HIGH
- **CVSS Score:** 8.3 (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)
- **CWE:** CWE-306, CWE-345, CWE-924
- **Published:** Aug 21, 2026
- **Last Modified:** Aug 26, 2026

## 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.

## Affected Products

- Basekick-Labs — arc (< 2026.06.1)

## References

- [CNA](https://github.com/Basekick-Labs/arc/security/advisories/GHSA-wfgr-8x84-22q7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.2

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._