CVE-2026-59271 Overview
CVE-2026-59271 is an information disclosure vulnerability in Spring AMQP. When the RabbitMQ management aliveness check fails, Spring AMQP embeds the configured admin password in cleartext inside the thrown exception message. Applications that log or propagate exceptions expose the credential to log files, monitoring pipelines, and error-tracking services.
The issue affects Spring AMQP 4.1.0, 4.0.0 through 4.0.4, 3.2.0 through 3.2.12, and 2.4.18 and earlier releases. Downstream systems ingesting these logs may retain the plaintext credential beyond the application boundary.
Critical Impact
RabbitMQ management admin credentials are written in cleartext to exception messages, exposing them to any subsystem that captures application logs.
Affected Products
- Spring AMQP 4.1.0
- Spring AMQP 4.0.0 through 4.0.4
- Spring AMQP 3.2.0 through 3.2.12
- Spring AMQP 2.4.18 and earlier
Discovery Timeline
- 2026-08-27 - CVE-2026-59271 published to NVD
- 2026-08-27 - Last updated in NVD database
Technical Details for CVE-2026-59271
Vulnerability Analysis
Spring AMQP provides an aliveness check that queries the RabbitMQ management HTTP API to confirm broker health. The check authenticates using the configured admin username and password. When the request fails, Spring AMQP constructs an exception that concatenates the failure context, including the plaintext admin password, into the exception message.
Any code path that catches the exception and calls getMessage(), toString(), or printStackTrace() writes the credential to its output sink. Common destinations include application log files, container stdout, centralized logging platforms, APM tools, and crash-reporting services. The credential exposure persists wherever those logs are retained.
The flaw is classified as an information disclosure issue [CWE-532: Insertion of Sensitive Information into Log File]. Exploitation does not grant direct broker access, but it hands attackers a valid administrative credential once they reach any log store containing the exception.
Root Cause
The root cause is improper handling of sensitive data during error construction. Spring AMQP includes the credential material used by the failed request in the exception payload instead of redacting it or referencing it by identifier only.
Attack Vector
An attacker does not directly trigger the vulnerability against the broker. Instead, the attacker obtains access to logs, telemetry, or crash reports that captured the exception. Any transient RabbitMQ management API failure produces the leaking exception. Attackers with read access to log aggregation systems, backup archives, or shared observability tooling can harvest the admin password and authenticate to the RabbitMQ management interface.
No verified exploit code is available. The vulnerability mechanism is described in the Spring Security Advisory for CVE-2026-59271.
Detection Methods for CVE-2026-59271
Indicators of Compromise
- Log entries containing RabbitMQ management aliveness check exceptions with URL, username, and password fragments visible in the message body.
- Unexpected successful logins to the RabbitMQ management console from IP addresses associated with log access rather than application infrastructure.
- Access to log aggregation platforms from accounts that do not normally query RabbitMQ-related indexes.
Detection Strategies
- Scan existing log repositories for strings such as aliveness, RabbitMQ, and exception class names emitted by org.springframework.amqp combined with credential-like tokens.
- Enable regular expression alerts in the logging platform for password patterns adjacent to RabbitMQ management URLs.
- Correlate RabbitMQ management API authentication events with the source of subsequent administrative actions to identify credential reuse from unexpected locations.
Monitoring Recommendations
- Monitor RabbitMQ management API access logs for administrative logins from new IP ranges after any known aliveness failure.
- Alert on new RabbitMQ user creation, permission changes, or policy modifications following a management API failure event.
- Track exception rates for Spring AMQP components and treat sustained aliveness failures as a credential exposure trigger, not just an availability issue.
How to Mitigate CVE-2026-59271
Immediate Actions Required
- Upgrade Spring AMQP to a fixed release referenced in the Spring Security Advisory for CVE-2026-59271.
- Rotate the RabbitMQ management admin password on every broker whose credentials were configured in an affected Spring AMQP application.
- Purge or redact historical log entries and backups that contain the leaked exception messages.
- Review access to log aggregation platforms and revoke unnecessary read permissions.
Patch Information
Refer to the Spring Security Advisory for CVE-2026-59271 for the specific fixed versions across the 2.4.x, 3.2.x, 4.0.x, and 4.1.x branches. Apply the corresponding patched release to each affected application.
Workarounds
- Disable the RabbitMQ management aliveness check in Spring AMQP configuration if it is not required for operations.
- Configure the RabbitMQ management client to use a dedicated, least-privileged monitoring account distinct from the administrative account.
- Add a logging filter that redacts password fields from exception messages before they reach persistent storage.
- Ensure logs are stored in access-controlled repositories with short retention until patched builds are deployed.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
