CVE-2025-15534 identifies an integer overflow vulnerability in the raylib open-source multimedia library developed by raysan5, specifically in the LoadFontData function within src/rtext.c. The vulnerability occurs due to improper validation or handling of integer values during the loading and processing of font data, which can cause an integer overflow. This overflow can lead to memory corruption, potentially resulting in application crashes or arbitrary code execution. The vulnerability requires the attacker to have local access with low privileges and does not require user interaction, making exploitation feasible only in scenarios where an attacker already has some level of system access. The vulnerability affects raylib versions up to commit 909f040. A patch identified by commit 5a3391fdce046bc5473e52afbd835dd2dc127146 has been released to address the issue. The CVSS v4.0 score is 4.8 (medium severity), reflecting the limited attack vector (local), low complexity, and partial impact on confidentiality, integrity, and availability. No known exploits are currently reported in the wild, but a public exploit exists, increasing the risk of exploitation in compromised environments. Organizations using raylib for multimedia or graphical applications should update to the patched version to prevent potential exploitation.

For European organizations, the impact of this vulnerability is primarily on systems that utilize raylib for multimedia, graphical, or game development purposes. Since exploitation requires local access, the threat is significant in environments where multiple users share systems or where attackers can gain initial footholds through other means (e.g., phishing, insider threats). Successful exploitation could lead to application crashes, denial of service, or potentially privilege escalation if combined with other vulnerabilities, thereby compromising system integrity and availability. Confidentiality impact is limited but not negligible if memory corruption leads to unauthorized data access. Organizations in sectors such as software development, digital media, education, and research that rely on raylib may face operational disruptions or security breaches. The medium severity score suggests moderate risk, but the presence of a public exploit increases urgency for patching. The vulnerability does not pose a direct remote threat, reducing risk for perimeter defenses but emphasizing the need for internal security controls.

1. Immediately apply the official patch identified by commit 5a3391fdce046bc5473e52afbd835dd2dc127146 to all affected raylib installations. 2. Restrict local access to systems running raylib-based applications to trusted users only, employing strict access controls and user privilege management. 3. Implement application whitelisting and runtime protections to detect and prevent exploitation attempts involving memory corruption. 4. Conduct regular code audits and static analysis on applications using raylib to identify potential misuse of font loading functions. 5. Employ endpoint detection and response (EDR) solutions to monitor for suspicious local activity indicative of exploitation attempts. 6. Educate developers and system administrators about the vulnerability and the importance of applying patches promptly. 7. For environments where patching is delayed, consider sandboxing or isolating raylib-dependent applications to limit impact. 8. Maintain up-to-date backups and incident response plans to quickly recover from potential exploitation consequences.