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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

7.1 · 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 · score source

EPSS

• CVE-2026-47735: 0.43% estimated exploitation activity in the next 30 days; percentile 37.32 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary Arc's user-SQL validator (internal/api/query.go:ValidateSQLRequest) blocked only readparquet( and arcpartitionagg( via regex denylist. The broader DuckDB I/O function family — readcsvauto, readcsv, readjson, readjsonauto, readtext, readblob, glob, parquetmetadata, parquetschema, readxlsx, 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. Impact Any authenticated user, including a token with permissions: [], can read arbitrary local files via: Confirmed reachable targets: - auth.db — bcrypt hashes for every API token, plus legacy SHA-256 rows. - arc.toml — S3 secrets, TLS keys. - /proc/self/environ — environment-variable secrets. - Cross-tenant Parquet files — bypasses RBAC because the tenant scope is enforced at the table layer, not on raw file paths. - SSRF when httpfs is loaded (any S3-backed deployment) — readcsvauto('http://169.254.169.254/latest/meta-data/...')…

Published by the source

8 Jun 2026, 23:51 UTC

Last modified by the source

8 Jun 2026, 23:51 UTC

Source last checked

26 Oct 2026, 15:23 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-p2j4-c4g6-rpf5

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-47735

Advisory: Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses RBAC table-level checks
IDs: CVE-2026-47735, GHSA-p2j4-c4g6-rpf5
Record: https://patchnext.com/advisories/cve-2026-47735 (revision 1, source checked 26 Oct 2026, 15:23 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/basekick-labs/arc 0.0.0-20260520141557-91bdc29d1a02. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/basekick-labs/arc: affected < 0.0.0-20260520141557-91bdc29d1a02; fixed in 0.0.0-20260520141557-91bdc29d1a02

## Suggested inspection (read-only)
- Go github.com/basekick-labs/arc: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/basekick-labs/arc.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-p2j4-c4g6-rpf5 (GitHub-reviewed advisory GHSA-p2j4-c4g6-rpf5 lists affected ranges: Go github.com/basekick-labs/arc >=0 <0.0.0-20260520141557-91bdc29d1a02)

Commands are suggestions: review each one before running it.