@fastify/multipart is a Fastify plugin for parsing the multipart content-type. A vulnerability exists in versions prior to 8.3.1 and 9.0.3 where the `saveRequestFiles` function does not remove uploaded temporary files when a user cancels the request. This omission can lead to resource exhaustion and adversely affect the application's availability.
The vulnerability has been assigned a CVSS score of 7.5, indicating high severity. It is categorized with a network attack vector and low attack complexity, meaning that it can be exploited without requiring privileged access or user interaction. The potential risk includes significant availability impact, as unremoved temporary files may lead to excessive resource consumption.
Organizations using affected versions should implement the recommended update to versions 8.3.1 or 9.0.3 to mitigate this issue. Until the patch is applied, it is advised to avoid using the `saveRequestFiles` function to prevent potential resource exhaustion.
Given the high availability impact and the status of the vulnerability as deferred, organizations should prioritize patching to avoid potential disruptions in service.
Vulnerability Details
@fastify/multipart is a Fastify plugin designed for parsing the multipart content-type, which is commonly used for file uploads. The vulnerability arises from the failure of the `saveRequestFiles` function to delete temporary files when a user cancels a file upload request. This can lead to resource exhaustion as these temporary files accumulate.
The vulnerability is classified under CWE-770: Allocation of Resources Without Limits or Throttling. It was published on January 23, 2025, and has a CVSS score of 7.5, indicating a high-severity vulnerability. The affected versions include all prior to 8.3.1 and 9.0.3, which address this issue.
Technical Analysis
This vulnerability allows for resource exhaustion due to the failure to manage temporary files effectively. The `saveRequestFiles` function's inability to delete these files on request cancellation means that as multiple requests are processed, the server can run out of available storage or memory.
The attack vector is network-based, meaning that an attacker can exploit the vulnerability remotely without needing physical access to the server. The attack complexity is low, as it does not require elevated privileges or user interaction, making it easier for attackers to exploit.
In terms of impact, the availability impact is categorized as high, while confidentiality and integrity impacts are none. This indicates that the primary concern is the potential downtime or degraded performance of the affected application.
Risk & Impact Analysis
Risk to organizations includes the possibility of service interruptions and degraded application performance due to excessive consumption of resources. Given the nature of web applications, failure to manage resources can lead to significant downtime, affecting user experience and trust.
The blast radius of this vulnerability can potentially affect all users of the affected Fastify application, leading to a broader impact on business operations. The urgency for organizations to address this vulnerability is high, considering the potential for exploitation with minimal effort.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of @fastify/multipart prior to 8.3.1 and 9.0.3 are affected by this vulnerability. Organizations using these versions should upgrade to the latest patched versions immediately to mitigate the risk of resource exhaustion.
Mitigation & Remediation
Organizations should upgrade to @fastify/multipart version 8.3.1 or 9.0.3 to remediate this vulnerability. If immediate upgrading is not feasible, organizations are advised to refrain from using the `saveRequestFiles` function until the upgrade can be performed.
For a thorough assessment and to identify similar weaknesses, organizations may consider engaging in penetration testing to validate the effectiveness of their remediation efforts.
Detection Guidance
Organizations should monitor system logs for any unusual patterns of resource consumption that may indicate exploitation attempts. Additionally, they should look for behavioral anomalies that could suggest unauthorized file uploads or cancellation events.
AppSecure Threat Intelligence Insight
CVE-2025-24033 highlights the importance of effective resource management in application design. The fact that this vulnerability remains deferred indicates a potential gap in proactive security measures within the Fastify ecosystem.
Security teams should leverage this incident as a learning opportunity to enhance their vulnerability management practices. Implementing rigorous testing and validation processes can help prevent similar vulnerabilities from affecting their applications.
For further insights, organizations can explore our resources on penetration testing methodology and vulnerability management program design to bolster their defenses against future vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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