CVE-2025-47907: Golang Go Race Condition Vulnerability

CVE-2025-47907 Overview

CVE-2025-47907 is a race condition vulnerability in the Go programming language's database/sql package. The vulnerability occurs when cancelling a query (e.g., by cancelling the context passed to one of the query methods) during a call to the Scan method of the returned Rows. This can result in unexpected results if other queries are being made in parallel, potentially causing the call to Scan to return either unexpected results from another query or an error.

Critical Impact

This race condition can lead to data integrity issues where query results may be overwritten with data from a different parallel query, potentially exposing sensitive information across request boundaries or causing application logic errors.

Affected Products

• Golang Go (multiple versions)

Discovery Timeline

• 2025-08-07 - CVE CVE-2025-47907 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2025-47907

Vulnerability Analysis

This vulnerability stems from improper synchronization in the Go database/sql package when handling concurrent query operations combined with context cancellation. When a query context is cancelled while the Scan method is actively processing results, a race condition can occur that allows data from parallel queries to contaminate the expected result set.

The vulnerability requires concurrent database operations to be exploited, making it particularly relevant for high-traffic applications that perform multiple simultaneous database queries. The race condition occurs at the boundary between context cancellation handling and row scanning operations, where proper locking or synchronization was not enforced.

Root Cause

The root cause is classified as CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization). The database/sql package's internal handling of row data and connection pooling did not properly isolate query results during context cancellation events, allowing shared state to be corrupted when multiple goroutines access database connections simultaneously.

Attack Vector

The vulnerability is exploitable over the network by any application that processes concurrent database queries. An attacker who can influence the timing of query cancellations—such as through crafted requests that trigger timeouts or cancellations—could potentially cause information disclosure by having query results from one session leak into another.

The exploitation scenario involves:

1. Multiple concurrent database queries using shared connection pools
2. Context cancellation occurring during the Scan operation
3. Race condition causing result data from one query to overwrite another
4. Potential exposure of sensitive data across request boundaries

For detailed technical information, see the Go.dev Issue Report #74831 and the Openwall OSS Security Discussion.

Detection Methods for CVE-2025-47907

Indicators of Compromise

• Unexpected or inconsistent data returned from database queries
• Application errors indicating type mismatches during Scan operations
• Intermittent failures in database query results under high concurrency
• User reports of seeing data that belongs to other sessions or requests

Detection Strategies

• Monitor application logs for unexpected Scan errors or type conversion failures that occur sporadically under load
• Implement request tracing to correlate database query results with expected values
• Use race detection tools (go run -race) during testing and staging environments
• Audit code paths that combine context cancellation with parallel database queries

Monitoring Recommendations

• Enable verbose database driver logging to track connection pool behavior and query lifecycle events
• Implement application-level validation to verify query results match expected schemas
• Set up alerting for increases in database-related errors during high concurrency periods
• Monitor for unusual patterns in context cancellation rates that could indicate exploitation attempts

How to Mitigate CVE-2025-47907

Immediate Actions Required

• Update Golang Go to a patched version as specified in Go.dev Change Log #693735
• Review application code for patterns that combine context cancellation with concurrent database queries
• Consider implementing application-level synchronization around critical database operations
• Test applications under concurrent load with race detection enabled

Patch Information

The Go team has released a patch addressing this race condition. Detailed patch information is available at Go.dev Change Log #693735 and the official Go.dev Vulnerability Report GO-2025-3849. Organizations should update to the patched Go version immediately and rebuild affected applications.

Workarounds

• Avoid cancelling query contexts while Scan operations are in progress
• Serialize database operations in critical code paths to prevent concurrent access
• Implement mutex locks around database query blocks that use context cancellation
• Use separate database connections for queries that may be cancelled versus long-running queries

# Check your Go version and update
go version
# Update to the latest patched Go version
go install golang.org/dl/go1.XX.X@latest
# Rebuild applications with race detection to verify fix
go build -race ./...