CVE-2025-68971 Overview
In Forgejo through version 13.0.3, a denial of service vulnerability exists in the attachment component. The vulnerability allows authenticated attackers to upload multi-gigabyte file attachments that can be associated with issues or releases, potentially exhausting server resources and causing service disruption for legitimate users.
Critical Impact
Authenticated users can exhaust server storage and memory resources by uploading extremely large file attachments, leading to denial of service conditions that affect all users of the Forgejo instance.
Affected Products
- Forgejo versions through 13.0.3
- Forgejo attachment component (issues and releases functionality)
Discovery Timeline
- 2026-03-16 - CVE-2025-68971 published to NVD
- 2026-03-17 - Last updated in NVD database
Technical Details for CVE-2025-68971
Vulnerability Analysis
This vulnerability is classified as CWE-400 (Uncontrolled Resource Consumption), a resource exhaustion vulnerability that occurs when the Forgejo attachment component fails to properly validate or limit the size of uploaded file attachments. The attack can be executed over the network by any authenticated user with permissions to create issues or releases.
The vulnerability requires low attack complexity and no user interaction to exploit. While the confidentiality and integrity of the system remain unaffected, the availability impact is significant. An attacker can repeatedly upload extremely large files (multi-gigabyte in size) to overwhelm server storage capacity, consume excessive memory during file processing, and degrade or completely disrupt service for all legitimate users.
Root Cause
The root cause of this vulnerability lies in insufficient input validation within the attachment upload functionality. Forgejo through version 13.0.3 does not implement adequate file size restrictions or upload rate limiting for attachments associated with issues and releases. This allows attackers to bypass normal resource management controls and consume disproportionate amounts of server resources through oversized file uploads.
Attack Vector
The attack is network-based and requires the attacker to have low-level privileges (authenticated user access). An attacker can exploit this vulnerability by:
- Authenticating to a vulnerable Forgejo instance
- Creating or accessing an issue or release
- Uploading one or more extremely large file attachments (multi-gigabyte files)
- Repeating the process to exhaust available storage space and processing resources
The lack of proper file size validation allows these oversized uploads to proceed unchecked, consuming disk space and potentially causing memory exhaustion during file handling operations. This can result in degraded performance for all users or complete service unavailability.
Detection Methods for CVE-2025-68971
Indicators of Compromise
- Unusually large files appearing in Forgejo attachment storage directories
- Rapid consumption of disk space on servers hosting Forgejo instances
- Multiple large file upload requests from single user accounts in short time periods
- Server resource alerts indicating storage capacity approaching limits
Detection Strategies
- Monitor attachment upload sizes and flag uploads exceeding normal thresholds
- Implement logging for all attachment upload operations with file size metadata
- Configure alerts for disk utilization spikes on Forgejo server storage volumes
- Review access logs for patterns of repeated large file uploads from individual accounts
Monitoring Recommendations
- Establish baseline metrics for typical attachment sizes in your Forgejo deployment
- Set up automated alerts when upload sizes exceed organizational thresholds
- Monitor server disk space utilization with alerts at 80% and 90% capacity thresholds
- Track per-user upload volume to identify potential abuse patterns
How to Mitigate CVE-2025-68971
Immediate Actions Required
- Review current Forgejo version and upgrade if running version 13.0.3 or earlier
- Audit recent attachment uploads to identify any suspiciously large files
- Implement web server or reverse proxy level file size limits as an interim measure
- Monitor disk space utilization on Forgejo servers for unexpected consumption
Patch Information
Organizations should monitor the Forgejo Code Repository for security updates addressing this vulnerability. Additional technical details and related datasets are available at FreeBSD Bug Report #291973, Zenodo Dataset #18945481, and Zenodo Dataset #19058493.
Workarounds
- Configure web server (nginx/Apache) upload size limits to restrict maximum file sizes before they reach Forgejo
- Implement reverse proxy rules to reject oversized upload requests
- Review and restrict user permissions for creating issues and releases to trusted accounts only
- Set up disk quotas on storage volumes used by Forgejo to limit impact of resource exhaustion attacks
# Example nginx configuration to limit upload size
# Add to server or location block
client_max_body_size 50M;
# Example Apache configuration
LimitRequestBody 52428800
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
