CVE-2026-41730 Overview
CVE-2026-41730 is an information disclosure vulnerability in Spring Data REST. The framework serializes the full exception cause chain into HTTP error response bodies. When an unhandled exception occurs during request processing, the resulting JSON error payload includes nested cause messages from lower layers. These messages can reveal persistence-layer internals such as SQL fragments, JPA entity details, database constraint names, and stack-trace context to any HTTP client. The flaw is tracked under CWE-209: Generation of Error Message Containing Sensitive Information.
Critical Impact
Remote unauthenticated clients can trigger errors and harvest persistence-layer details from response bodies, aiding reconnaissance for follow-on attacks against the database and application logic.
Affected Products
- Spring Data REST 3.7.0 through 3.7.19
- Spring Data REST 4.3.0 through 4.3.16, 4.4.0 through 4.4.14, 4.5.0 through 4.5.11
- Spring Data REST 5.0.0 through 5.0.5
Discovery Timeline
- 2026-06-10 - CVE-2026-41730 published to NVD
- 2026-06-10 - Last updated in NVD database
Technical Details for CVE-2026-41730
Vulnerability Analysis
Spring Data REST exposes Spring Data repositories as hypermedia-driven HTTP endpoints. When request handling fails, the framework builds a JSON error response containing the exception message and walks the Throwable.getCause() chain, serializing each nested cause message into the response body. Lower-level exceptions originate from Hibernate, JDBC drivers, and validation layers, so their messages frequently embed generated SQL, bind parameters, column names, constraint identifiers, and entity class references. An unauthenticated attacker who can reach a REST endpoint can submit malformed payloads, invalid identifiers, or constraint-violating data to surface these internals.
Root Cause
The root cause is overly verbose error serialization. The default exception handler does not strip or sanitize the cause chain before writing it to the HTTP response. Sensitive diagnostic information intended for server logs is returned directly to the client, violating the principle of separating internal diagnostics from external responses.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker sends crafted HTTP requests to a Spring Data REST endpoint that trigger persistence exceptions, for example by posting payloads that violate a unique constraint or by requesting resources with malformed identifiers. The server responds with a JSON error containing the chained cause messages. Repeating this across endpoints lets the attacker map the schema, identify ORM mappings, and refine subsequent injection or logic attacks.
No verified proof-of-concept code is published. Refer to the Spring Security Advisory for CVE-2026-41730 for technical details.
Detection Methods for CVE-2026-41730
Indicators of Compromise
- HTTP 4xx or 5xx responses from Spring Data REST endpoints whose JSON bodies contain nested cause fields, SQL fragments, or Hibernate exception class names.
- Bursts of malformed requests targeting /profile, repository collection URIs, or item URIs with invalid identifiers and bodies designed to violate constraints.
- Access-log entries showing the same client iterating across multiple repository paths with elevated error rates.
Detection Strategies
- Inspect outbound HTTP response bodies at the reverse proxy or WAF for tokens such as SQLException, ConstraintViolation, org.hibernate, or PSQLException.
- Add application-layer logging that records when serialized error responses exceed expected size or contain framework-internal class names.
- Correlate client IPs that generate disproportionate persistence-error responses against Spring Data REST routes.
Monitoring Recommendations
- Forward application access and error logs to a centralized SIEM and alert on spikes in 4xx/5xx responses from repository endpoints.
- Track per-endpoint error ratios over time to surface reconnaissance behavior.
- Review WAF telemetry for repeated requests producing oversized JSON error bodies.
How to Mitigate CVE-2026-41730
Immediate Actions Required
- Upgrade Spring Data REST to a fixed maintenance release on your branch as identified in the Spring Security Advisory.
- Register a global @ControllerAdvice exception handler that returns generic error messages and omits the cause chain.
- Restrict direct internet exposure of Spring Data REST endpoints until patched.
Patch Information
Spring has issued fixes across the supported branches. Upgrade beyond the affected ranges: 3.7.19, 4.3.16, 4.4.14, 4.5.11, and 5.0.5. Consult the vendor advisory for the exact fixed versions applicable to your branch and rebuild dependent applications.
Workarounds
- Implement a RepositoryRestExceptionHandler or ResponseEntityExceptionHandler that maps exceptions to sanitized payloads containing only an error code and a non-sensitive message.
- Disable verbose error responses by setting server.error.include-message=never, server.error.include-stacktrace=never, and server.error.include-binding-errors=never in application.properties.
- Place a reverse proxy or WAF rule in front of the application that rewrites error bodies containing persistence-layer keywords before they reach clients.
# Spring Boot configuration to suppress verbose error details
server.error.include-message=never
server.error.include-stacktrace=never
server.error.include-binding-errors=never
server.error.include-exception=false
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
