Vulnerability-Lookup

CVE-2026-47735 (GCVE-0-2026-47735)

Vulnerability from cvelistv5 – Published: 2026-08-21 22:42 – Updated: 2026-08-25 13:35

Title

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

Summary

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`.

Severity

7.1 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-25 13:35 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7712 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/Basekick-Labs/arc/security/adv…	x_refsource_CONFIRM
https://github.com/Basekick-Labs/arc/pull/442	x_refsource_MISC
https://github.com/Basekick-Labs/arc/commit/91bdc…	x_refsource_MISC
https://github.com/Basekick-Labs/arc/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
Basekick-Labs	arc	Affected: < 2026.06.1	guessed

Show details on NVD website

JSON

To clipboard

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          },
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}

FKIE_CVE-2026-47735

Vulnerability from fkie_nvd - Published: 2026-08-21 23:16 - Updated: 2026-10-12 16:10

Severity

7.1 (High) - 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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/Basekick-Labs/arc/commit/91bdc29d1a02178ccf8c66375eccf85203108dfb
	security-advisories@github.com	https://github.com/Basekick-Labs/arc/pull/442
	security-advisories@github.com	https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1
	security-advisories@github.com	https://github.com/Basekick-Labs/arc/security/advisories/GHSA-p2j4-c4g6-rpf5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "arc",
          "vendor": "Basekick-Labs",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2026.06.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Arc is an open, SQL-native time-series database for telemetry. Prior to version 26.06.1, Arc\u0027s 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 \u2014 `read_csv_auto`, `read_csv`, `read_json`, `read_json_auto`, `read_text`, `read_blob`, `glob`, `parquet_metadata`, `parquet_schema`, `read_xlsx`, etc. \u2014 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`."
    },
    {
      "lang": "es",
      "value": "Arc es una base de datos de series temporales abierta, nativa de SQL, para telemetr\u00eda. Antes de la versi\u00f3n 26.06.1, el validador SQL de usuario de Arc (\u0027internal/api/query.go:ValidateSQLRequest\u0027) bloqueaba solo \u0027read_parquet(\u0027 y \u0027arc_partition_agg(\u0027 a trav\u00e9s de una lista de denegaci\u00f3n de expresiones regulares. La familia m\u00e1s amplia de funciones de E/S de DuckDB - \u0027read_csv_auto\u0027, \u0027read_csv\u0027, \u0027read_json\u0027, \u0027read_json_auto\u0027, \u0027read_text\u0027, \u0027read_blob\u0027, \u0027glob\u0027, \u0027parquet_metadata\u0027, \u0027parquet_schema\u0027, \u0027read_xlsx\u0027, etc. - no estaba bloqueada. La extracci\u00f3n de referencias de tablas RBAC inspeccionaba solo las cl\u00e1usulas \u0027FROM\u0027/\u0027JOIN\u0027, por lo que las funciones de tabla escalares en la lista \u0027SELECT\u0027 pasaron desapercibidas por ambas capas. Esto se corrigi\u00f3 en 2026.06.1 mediante un sybox estructural en la capa de DuckDB. Despu\u00e9s del bloqueo, DuckDB se niega a abrir cualquier archivo fuera de la lista de permitidos y se niega a realizar m\u00e1s \u0027INSTALL\u0027/\u0027LOAD\u0027. Las extensiones ya cargadas siguen siendo invocables. Algunas soluciones alternativas est\u00e1n disponibles. Restrinja el acceso a la API a redes de confianza conocidas mediante reglas de cortafuegos o, como una mitigaci\u00f3n temporal, a\u00f1ada \u0027read_csv\u0027/\u0027read_json\u0027/\u0027glob\u0027, etc. a \u0027dangerousSQLPattern\u0027 en \u0027internal/api/query.go\u0027."
    }
  ],
  "id": "CVE-2026-47735",
  "lastModified": "2026-10-12T16:10:00.220",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47735",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-25T13:35:46.351832Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-21T23:16:24.917",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Basekick-Labs/arc/commit/91bdc29d1a02178ccf8c66375eccf85203108dfb"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Basekick-Labs/arc/pull/442"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Basekick-Labs/arc/releases/tag/v26.06.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/Basekick-Labs/arc/security/advisories/GHSA-p2j4-c4g6-rpf5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        },
        {
          "lang": "en",
          "value": "CWE-200"
        },
        {
          "lang": "en",
          "value": "CWE-918"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-P2J4-C4G6-RPF5

Vulnerability from github – Published: 2026-06-08 23:51 – Updated: 2026-06-08 23:51

Summary

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

Details

Summary

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.

Impact

Any authenticated user, including a token with permissions: [], can read arbitrary local files via:

POST /api/v1/query
Authorization: Bearer <token>
{"sql": "SELECT * FROM read_csv_auto('/etc/passwd', header=false, columns={'l':'VARCHAR'}) LIMIT 5"}

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) — read_csv_auto('http://169.254.169.254/latest/meta-data/...') reaches instance metadata IPs.

Patches

Fixed in 2026.06.1 (PR #442) via a structural sandbox at the DuckDB layer:

SET GLOBAL allowed_directories = [...] enumerates Arc's legitimate filesystem prefixes (storage roots + tier prefixes + import upload dir + compaction temp).
SET GLOBAL enable_external_access = false (one-way at runtime).
Verified by reading back the flag.

After lockdown, DuckDB refuses to open any file outside the allowlist and refuses further INSTALL/LOAD. Already-loaded extensions remain callable.

Workarounds

Restrict API access to known-trusted networks via firewall rules.
Temporary mitigation: add read_csv*/read_json*/glob etc. to dangerousSQLPattern in internal/api/query.go pending 2026.06.1.

Credits

Reported by Alex Manson (@NeuroWinter, https://neurowinter.com/) on 2026-05-19.

Severity

7.1 (High)


                  
                    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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/basekick-labs/arc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260520141557-91bdc29d1a02"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-47735"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-22",
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-08T23:51:19Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Summary\n\nArc\u0027s 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 \u2014 `read_csv_auto`, `read_csv`, `read_json`, `read_json_auto`, `read_text`, `read_blob`, `glob`, `parquet_metadata`, `parquet_schema`, `read_xlsx`, etc. \u2014 was not blocked. RBAC table-reference extraction inspected only `FROM`/`JOIN` clauses, so scalar table functions in the `SELECT` list slipped past both layers.\n\n### Impact\n\nAny authenticated user, including a token with `permissions: []`, can read arbitrary local files via:\n\n```\nPOST /api/v1/query\nAuthorization: Bearer \u003ctoken\u003e\n{\"sql\": \"SELECT * FROM read_csv_auto(\u0027/etc/passwd\u0027, header=false, columns={\u0027l\u0027:\u0027VARCHAR\u0027}) LIMIT 5\"}\n```\n\nConfirmed reachable targets:\n\n- `auth.db` \u2014 bcrypt hashes for every API token, plus legacy SHA-256 rows.\n- `arc.toml` \u2014 S3 secrets, TLS keys.\n- `/proc/self/environ` \u2014 environment-variable secrets.\n- Cross-tenant Parquet files \u2014 bypasses RBAC because the tenant scope is enforced at the table layer, not on raw file paths.\n- SSRF when `httpfs` is loaded (any S3-backed deployment) \u2014 `read_csv_auto(\u0027http://169.254.169.254/latest/meta-data/...\u0027)` reaches instance metadata IPs.\n\n### Patches\n\nFixed in 2026.06.1 (PR #442) via a structural sandbox at the DuckDB layer:\n\n1. `SET GLOBAL allowed_directories = [...]` enumerates Arc\u0027s legitimate filesystem prefixes (storage roots + tier prefixes + import upload dir + compaction temp).\n2. `SET GLOBAL enable_external_access = false` (one-way at runtime).\n3. Verified by reading back the flag.\n\nAfter lockdown, DuckDB refuses to open any file outside the allowlist and refuses further `INSTALL`/`LOAD`. Already-loaded extensions remain callable.\n\n### Workarounds\n\n- Restrict API access to known-trusted networks via firewall rules.\n- Temporary mitigation: add `read_csv*`/`read_json*`/`glob` etc. to `dangerousSQLPattern` in `internal/api/query.go` pending 2026.06.1.\n\n### Credits\n\nReported by Alex Manson ([@NeuroWinter](https://github.com/NeuroWinter), https://neurowinter.com/) on 2026-05-19.",
  "id": "GHSA-p2j4-c4g6-rpf5",
  "modified": "2026-06-08T23:51:19Z",
  "published": "2026-06-08T23:51:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Basekick-Labs/arc/security/advisories/GHSA-p2j4-c4g6-rpf5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Basekick-Labs/arc/pull/442"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Basekick-Labs/arc/commit/91bdc29d1a02178ccf8c66375eccf85203108dfb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Basekick-Labs/arc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Arc has an authenticated arbitrary local-file read via DuckDB I/O functions that bypasses RBAC table-level checks"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-47735 (GCVE-0-2026-47735)

FKIE_CVE-2026-47735

GHSA-P2J4-C4G6-RPF5

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