Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-47735Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses RBAC table-level checks
High 7.1
In plain English
A high-severity path traversal in arc from Basekick-Labs. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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`.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/basekick-labs/arc | 0.0.0-20260520141557-91bdc29d1a02 | GHSA-p2j4-c4g6-rpf5 |
| Go | github.com/basekick-labs/arc | 0.0.0-20260520141557-91bdc29d1a02 | GO-2026-5523 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Basekick-Labs | arc | < 2026.06.1 |
Weakness: CWE-22, CWE-200, CWE-918 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/Basekick-Labs/arc/security/advisories/GHSA-p2j4-c4g6-rpf5 x_refsource_CONFIRM
- https://github.com/Basekick-Labs/arc/pull/442 x_refsource_MISC
- https://github.com/Basekick-Labs/arc/commit/91bdc29d1a02178ccf8c66375eccf85203108dfb x_refsource_MISC
- https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1 x_refsource_MISC