Basekick-Labs Arc up to 2026.06.0 User-SQL Validator internal/api/query.go ValidateSQLRequest privileges management

Summaryinfo

A vulnerability classified as critical has been found in Basekick-Labs Arc up to 2026.06.0. Impacted is the function ValidateSQLRequest of the file internal/api/query.go of the component User-SQL Validator. This manipulation causes privileges management. This vulnerability is tracked as CVE-2026-47735. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Basekick-Labs Arc up to 2026.06.0 and classified as critical. Affected by this vulnerability is the function ValidateSQLRequest of the file internal/api/query.go of the component User-SQL Validator. The manipulation with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Arc is an open, SQL-native time-series database for telemetry. Prior to version 26.06.1, Arc's user-SQL validator (`internal/api/query.go:ValidateSQLRequest`) blocked only `read_parquet(` and `arc_partition_agg(` via regex denylist. The broader DuckDB I/O function family — `read_csv_auto`, `read_csv`, `read_json`, `read_json_auto`, `read_text`, `read_blob`, `glob`, `parquet_metadata`, `parquet_schema`, `read_xlsx`, etc. — was not blocked. RBAC table-reference extraction inspected only `FROM`/`JOIN` clauses, so scalar table functions in the `SELECT` list slipped past both layers. This is fixed in 2026.06.1 via a structural sandbox at the DuckDB layer. After lockdown, DuckDB refuses to open any file outside the allowlist and refuses further `INSTALL`/`LOAD`. Already-loaded extensions remain callable. Some workarounds are available. Restrict API access to known-trusted networks via firewall rules or, as a temporary mitigation, add `read_csv*`/`read_json*`/`glob` etc. to `dangerousSQLPattern` in `internal/api/query.go`.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-47735 since 05/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 2026.06.1 eliminates this vulnerability.

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Productinfo

Vendor

• Basekick-Labs

Name

• Arc

Version

• 2026.06

Website

• Product: https://github.com/Basekick-Labs/arc/

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