CVE-2026-57866: 
Apache Impala vulnerability analysis and mitigation

CVE-2026-57866 is a Server-Side Request Forgery (SSRF) vulnerability in Apache Impala versions 4.4.x and 4.5.x (specifically 4.4.0 through 4.5.1) that allows authenticated users to exfiltrate secrets from configured Hadoop credential providers. The vulnerability was disclosed on September 8, 2026, via the Apache security mailing list and published to the NVD on September 9, 2026. It carries a CVSS v3.1 base score of 8.8 (High) (Apache Advisory, GitHub Advisory). The vulnerability was reported by Andrey Rukin of Arenadata (oss-security).

The vulnerability is classified as CWE-918 (Server-Side Request Forgery) and resides in the ai_generate_text() built-in function of Apache Impala. An authenticated user with permission to invoke this function can craft requests that cause the Impala server to retrieve secrets stored in credential providers configured via the hadoop.security.credential.provider.path property in core-site.xml. The attacker must know the key name of the target secret, but no additional privileges beyond function execution rights are required. The attack is network-based, requires low privileges, and no user interaction, making it straightforward to exploit in environments where the function is broadly accessible (Apache Advisory, GitHub Advisory).

Successful exploitation allows an authenticated attacker to exfiltrate sensitive secrets — such as API keys, database passwords, or cloud credentials — stored in Hadoop-compatible credential providers (e.g., JCEKS keystores). Disclosure of these credentials could enable lateral movement to other systems or services that rely on the same credentials, significantly expanding the blast radius beyond the Impala cluster itself. The CVSS scoring reflects high impacts across confidentiality, integrity, and availability, as compromised credentials can be leveraged for further unauthorized access or data manipulation (GitHub Advisory, oss-security).

There is no public proof-of-concept exploit code and no evidence of in-the-wild exploitation at the time of disclosure (Apache Advisory). The EPSS score is approximately 0.20% (0.002010), indicating a low near-term probability of exploitation. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. Exploitation is not automatable per NVD SSVC assessment, as the attacker must know the specific secret key name and possess valid Impala credentials with ai_generate_text() execution permissions (GitHub Advisory).

1. Reconnaissance: Identify Apache Impala deployments running versions 4.4.0 through 4.5.1. Determine whether the hadoop.security.credential.provider.path property is configured in core-site.xml, and enumerate known or guessable secret key names (e.g., common patterns like fs.s3a.access.key, ssl.server.keystore.password).
2. Obtain valid credentials: Acquire an Impala user account with permissions to execute the ai_generate_text() function. This may be a legitimate low-privileged account or one obtained through credential theft.
3. Craft SSRF payload: Construct a SQL query invoking ai_generate_text() with parameters that direct the function to make a server-side request targeting the credential provider path, embedding the known secret key name to trigger secret retrieval.
4. Execute and capture output: Submit the crafted query via the Impala shell, JDBC/ODBC interface, or Hue. The server-side request causes Impala to resolve and return the secret value, which is reflected in the query output or an attacker-controlled endpoint.
5. Leverage exfiltrated secrets: Use the retrieved credentials to access downstream systems (e.g., S3 buckets, HDFS, databases, or external APIs) for further lateral movement or data exfiltration (oss-security, GitHub Advisory).

• Logs: Impala audit logs showing repeated or unusual invocations of the ai_generate_text() function by non-administrative users; queries containing credential provider key names as parameters.
• Network: Unexpected outbound HTTP/HTTPS requests from Impala daemon processes (impalad) to internal credential provider endpoints or external attacker-controlled hosts; unusual connections to JCEKS keystore paths or Hadoop KMS endpoints.
• Process: Impala server processes initiating connections to URLs or hosts not associated with normal AI/LLM API endpoints configured for ai_generate_text().
• Configuration: Review of core-site.xml access logs for unexpected reads of the hadoop.security.credential.provider.path property triggered by Impala processes.

Apache has released patches addressing this vulnerability; users should upgrade Apache Impala to version 4.5.2 or later (beyond the affected 4.4.0–4.5.1 range) (Apache Advisory). As an immediate workaround, restrict execution permissions for the ai_generate_text() function to only trusted, privileged users. Additionally, review and minimize the scope of credentials stored in hadoop.security.credential.provider.path, and implement network segmentation to restrict outbound requests from Impala processes to only known, authorized endpoints (GitHub Advisory).

The vulnerability was covered by security news aggregators including SecurityOnline.info and VulDB shortly after disclosure. The oss-security mailing list post by Michael Smith (Apache) generated community awareness, with the reporter Andrey Rukin of Arenadata credited for responsible disclosure (oss-security). No significant vendor statements beyond the official Apache advisory or notable researcher commentary have been identified at this time.