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CVE-2026-55098— Arc: DuckDB I/O aliases bypass database RBAC after CVE-2026-47735

Quick assessment

Affected
Basekick-Labs arc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Arc 是一个面向遥测数据的开源、原生支持 SQL 的时间序列数据库。在经仓库验证的 26.06.2 版本修复之前，针对 的修复措施仍遗留了一个跨数据库授权绕过漏洞，该漏洞利用 DuckDB 的表值 I/O 函数实现。 具体而言，在 中， 使用由 配置的 ；而 配置会阻止访问该多租户根目录之外的任何区域。 中的 函数将所有数据库存储在该根目录之下。 在 中， 函数会跳过后跟左括号的名称（即函数调用形式），而 则允许不包含任何提取到的表引用的查询通过，包括那些 （无权限）的令牌。虽然 黑名单能拦截字面量形式的 ，且早

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-55098

Vulnerability Information
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Vulnerability Title
Arc: DuckDB I/O aliases bypass database RBAC after CVE-2026-47735
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Basekick-Labs arc < 26.06.2 -

II. Public POCs for CVE-2026-55098

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III. Intelligence Information for CVE-2026-55098

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Other References for CVE-2026-55098 (4)

IV. Related Vulnerabilities

Same product: arc
Same vendor: Basekick-Labs
Same weakness: CWE-200