---
id: CVE-2026-48106
title: 'Arc is an open, SQL-native time-series database for telemetry'
summary: >-
  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)…
severity: high
cvss: 8.3
cvssVector: '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
vendor: Basekick-Labs
product: arc
affected:
  - arc < 2026.06.1
published: '2026-08-21'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:06:39.057'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-48106'
references:
  - url: >-
      https://github.com/Basekick-Labs/arc/security/advisories/GHSA-wfgr-8x84-22q7
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-08-26T17:47:11.822451Z'
cvssSource: cna
ingestedAt: '2026-09-14T08:21:35.408Z'
epss: 0.00224
epssPercentile: 0.11646
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.