CVE-2026-48106 Missing authorization in arc
Attackers on the cluster network can inject data into Arc Enterprise databases by sending unauthenticated replication messages, bypassing application-layer security checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-48106?
CVE-2026-48106 is a high-severity missing authorization vulnerability in Basekick-Labs arc, published on 21 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-48106?
How do I fix CVE-2026-48106?
No fix has been published for CVE-2026-48106 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-48106 being exploited?
There is no known exploitation of CVE-2026-48106 in the wild and no public exploit code.
Sources
Also known as GHSA-wfgr-8x84-22q7.