CVE-2026-42811 — AI Deep Analysis Summary

🚨 **Essence**: Apache Polaris fails to escape table/namespace names in GCS Credential Access Boundary (CAB) CEL expressions. 📉 **Consequences**: Short-lived, single-table GCS credentials become **bucket-wide**.…

🛡️ **CWE-917**: Improper Neutralization of Special Elements used in an Expression Language Statement. 🐛 **Flaw**: The code inserts namespace/table identifiers directly into CEL expressions **without escaping**.…

🏢 **Vendor**: Apache Software Foundation. 📦 **Product**: Apache Polaris. 📅 **Version**: Confirmed in **1.4.0**. ⚠️ **Scope**: Any deployment using GCS with Polaris, especially those with broad catalog permissions.

💀 **Attacker Actions**: - List/Read metadata of **other tables**. - Create/Delete objects in **other table prefixes**. - Access **unrelated external prefixes** in the same bucket. - Effectively gain **bucket-wide** read…

🔑 **Auth Required**: Yes. **PR:L** (Low Privileges). The attacker needs valid Polaris credentials to request a token for a specific table.…

🚫 **Public Exp?**: No public PoC or wild exploitation code available yet. 📝 **Status**: Confirmed via private testing on Polaris 1.4.0. The advisory link is available, but no automated exploit tools are circulating.

🔍 **Self-Check**: 1. Check if you use **Apache Polaris** with **GCS**. 2. Review if table/namespace names allow special characters (like `'`). 3. Monitor GCS logs for unexpected access from Polaris service accounts. 4.…

🛠️ **Fix**: Official advisory released on **2026-05-04**. 📥 **Action**: Update to the patched version of Apache Polaris immediately. The vendor has acknowledged the issue and provided a fix path.

🚧 **Workaround**: If patching is delayed, **restrict Polaris RBAC** to minimum permissions. Avoid using special characters (especially single quotes) in namespace/table names.…

🔥 **Priority**: **CRITICAL**. CVSS Score is high (AV:N/AC:L/PR:L/S:C/C:H/I:H/A:H). Since it grants bucket-wide access from a single table request, the impact is severe.…