CVE-2026-47735
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk21th percentile - higher than 21% of all known CVEs
Summary
Arc prior to version 26.06.1 blocked only read_parquet( and arc_partition_agg( via regex denylist in the user-SQL validator. Other DuckDB I/O functions (read_csv, read_json, glob, etc.) were not blocked. RBAC table-reference extraction only inspected FROM/JOIN clauses, so scalar table functions in SELECT slipped past. Fixed in 26.06.1 via a structural sandbox at the DuckDB layer.
Risk Assessment
An attacker could use DuckDB functions to read arbitrary files from the system, potentially leading to sensitive data leakage or integrity compromise.
Recommendation
Upgrade Arc to version 26.06.1 or later. Restrict API access to trusted networks or temporarily add read_csv*, read_json*, glob, etc. to dangerousSQLPattern in internal/api/query.go.
Other vulnerabilities in Arc
See all- CVE-2026-48106High
Arc Enterprise prior to version 26.06.1 validates only the wire-format envelope (length, opcode) of inbound messages in the cluster replication receiver. The MsgReplicateSync payload is accepted without any application-layer authentication (no HMAC, signature, or per-message nonce). Transport-layer TLS/mTLS does not protect against application-layer tampering or replay. Fixed in 2026.06.1.
- CVE-2026-48105High
Arc Enterprise prior to version 26.06.1 accepts attacker-chosen file paths in manifest-registration proposals in the Raft FSM without validating them against the configured storage backend. The only check is that the path is non-empty; there is no parent-traversal rejection, allowlist, scheme restriction, or length bound. Fixed in 2026.06.1.
- CVE-2026-48050High
Arc versions prior to 26.06.1 register Go's net/http/pprof handlers at /debug/pprof/* and add /debug/pprof to PublicPrefixes, making these endpoints reachable without authentication. Version 26.06.1 contains a patch. Workarounds include blocking /debug/pprof* at a reverse proxy or restricting the API port to trusted networks.
- CVE-2026-33922Medium
A path traversal vulnerability was discovered in the Offline archives functionality of the local web interface due to insufficient validation of an input parameter. A local user with administrative credentials for the web interface could submit an archive name containing traversal sequences and delete arbitrary files reachable by the Arc process, which runs with administrative privileges on the host.
Original NVD description (English source)
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`.