TI-2026-29910 Aliases CVE-2026-41309

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

MEDIUM 42CWE-400Published 2026-04-24 · Updated 2026-04-24

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: Low · None · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00369 30th percentileScored 2026-11-07

Fix Fixed opensource-socialnetwork (opensource-socialnetwork): 9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
opensource-socialnetwork	opensource-socialnetwork	before 9.0	9.0	Patch available	CNA

opensource-socialnetwork Vendoropensource-socialnetwork Affected before 9.0 Fixed in 9.0 Patch available CNA

Remediation

Fix · CNA opensource-socialnetwork (opensource-socialnetwork) Fixed in 9.0

Timeline

2026-10-02 Threatist record created from CVE-2026-41309
2026-10-06 EPSS moved to the 50th–90th percentile
2026-10-25 EPSS moved to the below the 50th percentile

References

Other 3

TI-2026-70532 Authorization bypass in OSSN exposes private message attachments CVSS 4.0HIGH 7.1
TI-2026-70945 Missing authorization in OSSN exposes album photos and stored files CVSS 4.0MEDIUM 6.9
TI-2025-39373 OSSN (Open Source Social Network) 8.6 is vulnerable to SQL Injection in… CVSS 3.1MEDIUM 6.5
TI-2020-08475 An issue was discovered in Open Source Social Network (OSSN) through 5.3. CVSS 3.1MEDIUM 5.9
TI-2025-39316 Open Source Social Network (OSSN) 8.6 is vulnerable to Cross Site Scripting (XSS) via the… CVSS 3.1HIGH 7.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences