CVE-2026-55098
Tenable Plugin
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AI Threat Summary
CVE-2026-55098 is a moderate vulnerability with a CVSS score of 6.5 affecting the target software. This vulnerability allows SQL injection leading to unauthorized data access. Threat hunters should monitor for exploit attempts and apply vendor patches immediately.
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.
Attack Chain
Attacker fingerprints web application and identifies injectable parameters using automated scanners
Attacker injects SQL payload via vulnerable parameter to bypass authentication or extract data
Attacker dumps database tables including user credentials, session tokens, and sensitive data
Extracted password hashes cracked offline using hashcat/john or plain-text credentials used directly
Valid credentials reused across other systems and services in the environment
MITRE ATT&CK Techniques
SQL injection exploited against web application database layer
Database contents exfiltrated including credentials and PII
Credentials stolen from database used for further access
Indicators of Compromise
| Type | Value | Description | |
|---|---|---|---|
| user_agent | Mozilla/5.0 (compatible; exploit/1.0) |
Generic exploit scanner user agent pattern | |
| url | /api/vuln-endpoint?payload=<malicious> |
Exploit attempt against application endpoint — monitor access logs for anomalous params | |
| url | ' OR 1=1-- |
Classic SQL injection payload — monitor WAF and DB query logs |
Remediation
Quick Facts
| CVE ID | CVE-2026-55098 |
| CVSS Score | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| Published | 2026-10-30 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |