{"id":86496,"date":"2026-02-18T15:15:55","date_gmt":"2026-02-18T15:15:55","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-48976-apache-commons-fileupload-dos-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-48976-apache-commons-fileupload-dos-vulnerability\/","title":{"rendered":"CVE-2025-48976: Apache Commons FileUpload DoS Vulnerability<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The Apache Commons FileUpload library, widely used software for handling file uploads in Java-based web applications, has been found to have a significant vulnerability (CVE-2025-48976). This vulnerability stems from insufficient limits on the allocation of resources for multipart headers, enabling a potential Denial of Service (DoS) attack. This issue is of critical concern to any system employing affected versions of Apache Commons FileUpload, as it may lead to system compromise or data leakage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-48976
\nSeverity: High (7.5 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Apache Commons FileUpload | 1.0 to 1.5
\nApache Commons FileUpload | 2.0.0-M1 to 2.0.0-M3<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability lies in the way Apache Commons FileUpload processes multipart headers. By sending a specially crafted multipart request with an excessive amount of data in the headers, an attacker can exhaust system resources, causing the application to become unresponsive, leading to a DoS condition. This could potentially be exploited further to gain unauthorized access or extract sensitive data.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

A conceptual example of the exploit might involve sending an HTTP POST request with an excessive amount of data in the multipart headers. An example might look like this:<\/p>\n

POST \/vulnerable\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: multipart\/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW\n------WebKitFormBoundary7MA4YWxkTrZu0gW\nContent-Disposition: form-data; name=\"file\"; filename=\"file.txt\"\nContent-Type: text\/plain\n[large amount of data]\n------WebKitFormBoundary7MA4YWxkTrZu0gW--<\/code><\/pre>\n
In the above example, the `[large amount of data]` will be replaced with an excessive amount of data, exhausting system resources and potentially leading to a DoS condition.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The Apache Commons FileUpload library, widely used software for handling file uploads in Java-based web applications, has been found to have a significant vulnerability (CVE-2025-48976). This vulnerability stems from insufficient limits on the allocation of resources for multipart headers, enabling a potential Denial of Service (DoS) attack. This issue is of critical concern to […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86496","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t