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CVE-2026-63740 medium CVSS 6.5

Authorization Flaw in surrealdb (CVE-2026-63740)

Summary

Vulnerability in surrealdb (CVE-2026-63740). Confidential information can be exposed externally. Exploitable via SELECT. Mitigation: upgrade to 3.1.4 or later.

Original description

The description as published by the source.

A SELECT permission defined on an array element (DEFINE FIELD field.* … PERMISSIONS FOR select …) is not enforced correctly for RECORD users. Instead of hiding the denied elements, the query leaks a subset of them: a deny-all returns the odd-indexed elements, and a per-element predicate keeps and drops the wrong ones.

The filter removed each denied element by index while walking the array forwards. Because removing an element shifts every later index down, each cut invalidated the indices still pending in the loop, leaving denied elements behind. Field-level permissions are enforced correctly; only the element (field.*) level is affected, and only for record users — root and record-owner sessions are not.

Impact

What an attacker can do:

  • As a record (scope) user, read array elements that an element-level (field.*) SELECT permission should hide, on any table they can already SELECT.
  • Recover denied elements through both a deny-all and a WHERE predicate — the wrong elements are selected either way.

What it can't do:

  • Bypass field-level SELECT permissions, which are evaluated correctly.
  • Affect root or record-owner sessions, or cross namespace/database isolation.
  • Modify data, escalate privileges, or affect availability (confidentiality only).

Patches

The three permission-filtering paths (doc/reduce.rs, doc/output.rs, exec/operators/scan/pipeline.rs) now remove denied elements in reverse index order, so removing one element no longer…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-63740 has been found in surrealdb.
Attackers can target a specific entry point like SELECT over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade surrealdb to 3.1.4 or later.
If unsure, ask your IT team or search "surrealdb CVE-2026-63740" on the vendor's site.

CVE-2026-63740 (surrealdb) — CWE-863 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: SELECT / RECORD / WHERE
Patched: 3.1.4 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Incorrect authorization (CWE-863) exists in surrealdb. Attackers reach the vulnerable code path via SELECT.

📍 Affected scope

Check the vendor advisory for the affected versions of surrealdb. Attack surface: SELECT / RECORD / WHERE.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 3.1.4.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'surrealdb' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'surrealdb' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で surrealdb を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade surrealdb to 3.1.4

    ステージング環境で 3.1.4 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

rust surrealdb
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.4"}]}]

References

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