Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
opensource-socialnetwork opensource-socialnetwork
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 8.2 · High EPSS 0.66% · P50
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-41309

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Open Source Social Network (OSSN) Vulnerable to Resource Exhaustion via Malicious Image Processing
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Open Source Social Network（OSSN） 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opensource-socialnetwork opensource-socialnetwork < 9.0 -

II. Public POCs for CVE-2026-41309

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-41309

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-41309 (1)

IV. Related Vulnerabilities

Same product: opensource-socialnetwork
Same vendor: opensource-socialnetwork
Same weakness: CWE-770

V. Comments for CVE-2026-41309

No comments yet

Leave a comment