CVE-2026-41309— Open Source Social Network (OSSN) Vulnerable to Resource Exhaustion via Malicious Image Processing

Open Source Social Network (OSSN) Vulnerable to Resource Exhaustion via Malicious Image Processing

Open Source Social Network (OSSN) is open-source social networking software developed in PHP. Versions prior to 9.0 are vulnerable to resource exhaustion. An attacker can upload a specially crafted image with extreme pixel dimensions (e.g., $10000 \times 10000$ pixels). While the compressed file size on disk may be small, the server attempts to allocate significant memory and CPU cycles during the decompression and resizing process, leading to a Denial of Service (DoS) condition. It is highly recommended to upgrade to OSSN 9.0. This version introduces stricter validation of image dimensions and improved resource management during the processing phase. Those who cannot upgrade immediately can mitigate the risk by adjusting their `php.ini` settings to strictly limit `memory_limit` and `max_execution_time` and/or implementing a client-side and server-side check on image headers to reject files exceeding reasonable pixel dimensions (e.g., $4000 \times 4000$ pixels) before processing begins.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

不加限制或调节的资源分配

Open Source Social Network（OSSN） 资源管理错误漏洞

Open Source Social Network（OSSN）是瑞士OSSN团队的一款源社交网络引擎。 Open Source Social Network（OSSN） 9.0之前版本存在资源管理错误漏洞，该漏洞源于资源耗尽，可能导致攻击者上传特制图像，服务器在解压缩和调整大小过程中分配大量内存和CPU周期，从而导致拒绝服务。

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