{"id":"CVE-2026-55098","published":"2026-10-30T20:17:09.773","lastModified":"2026-10-30T20:17:09.773","description":"Arc is an open, SQL-native time-series database for telemetry. Prior to the repository-verified 26.06.2 repair, the remediation of `CVE-2026-47735` leaves a cross-database authorization bypass through DuckDB table-valued I/O functions. In `internal/database/sandbox.go`, `allowed_directories` uses `cfg.LocalStorageRoot`, configured by `storage.local_path`, while `enable_external_access=false` blocks access outside that entire multi-tenant root. `GetStoragePath` in `internal/storage/util.go` stores all databases beneath it. In `internal/api/query.go`, `extractTableReferences` skips names followed by an opening parenthesis and `checkQueryPermissions` allows queries with no extracted table references, including tokens with `permissions: []`. The `userSQLReadParquetPattern` denylist catches literal `read_parquet(` and the earlier protection also blocks `arc_partition_agg(`, but misses the `parquet_scan` alias and `glob`, `parquet_metadata`, `parquet_schema`, `read_blob`, `read_csv_auto`, `read_json` and `read_text`. A request to `POST /api/v1/query` using these unblocked functions passes `ValidateSQLRequest` and `convertSQLToStoragePaths` without tenant authorization, allowing reads and enumeration of other databases' time-series data, schema and per-column value-range statistics within the allowlisted root. The sandbox still blocks out-of-root OS files and HTTP SSRF, and the sibling SQLite token database outside the root is not exposed by this mechanism. The earlier 26.06.1 remediation does not comprehensively deny these I/O functions. Repository tag 26.06.2 contains the I/O-function repair and supplies the provisional remediation boundary; conflicting advisory affected-version statements require curator adjudication.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-200","CWE-863"],"vendors":[],"products":[],"references":[{"url":"https://github.com/Basekick-Labs/arc/commit/5dc8f53b70a3871b16b0cebf328f07c578af7a45","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/pull/495","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/security/advisories/GHSA-93cm-2v4m-c56c","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/tree/v26.06.2","tags":[]}],"exploitRefs":[{"url":"https://github.com/Basekick-Labs/arc/commit/5dc8f53b70a3871b16b0cebf328f07c578af7a45","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/pull/495","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/security/advisories/GHSA-93cm-2v4m-c56c","tags":[]},{"url":"https://github.com/Basekick-Labs/arc/tree/v26.06.2","tags":[]}],"hasPoc":true,"ai":null}