Read the docs
TI-2026-35546 Aliases CVE-2026-48106

Missing authentication in Basekick-Labs arc

Priority MEDIUM 41CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-306.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00224 13th percentileScored 2026-11-07
Fix Fixed arc (Basekick-Labs): 2026.06.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Basekick-Labsarcbefore 2026.06.12026.06.1Patch availableCNA
  • arc VendorBasekick-Labs Affected before 2026.06.1 Fixed in 2026.06.1 Patch available CNA

Remediation

  • Fix · CNA arc (Basekick-Labs) Fixed in 2026.06.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48106

References

Other 1

  • TI-2026-40199 Arc: Unauthenticated cluster node admission when `cluster.shared_secret` is unset CVSS 4.0MEDIUM 6.9
  • TI-2026-83373 Cross-database authorization bypass in Arc via DuckDB I/O functions CVSS 3.1MEDIUM 6.5
  • TI-2026-35492 Arc: Unauthenticated access to Go debug pprof endpoints leaks runtime state and enables CPU-burn DoS CVSS 4.0HIGH 8.8
  • TI-2026-35545 Path traversal in Basekick-Labs arc CVSS 4.0HIGH 8.3
  • TI-2026-35236 Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses RBAC table-level checks CVSS 4.0HIGH 7.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences