CVE-2026-48106 (GCVE-0-2026-48106)

Vulnerability from cvelistv5 – Published: 2026-08-21 22:49 – Updated: 2026-08-26 17:47
VLAI
Title
Arc Enterprise cluster replication accepts unauthenticated MsgReplicateSync messages, enabling cluster-wide data injection from any TLS-trusted peer
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) 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.
Severity
8.3 (High)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-26 17:47 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-924 - Improper Enforcement of Message Integrity During Transmission in a Communication Channel
Assigner
References
Impacted products
Vendor Product Version
Basekick-Labs arc Affected: < 2026.06.1
Create a notification for this product.
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