CVE-2025-15534 is an integer overflow vulnerability identified in the raylib open-source graphics library maintained by raysan5, specifically affecting the LoadFontData function in the src/rtext.c source file. The vulnerability occurs due to improper handling of integer values when loading font data, leading to an integer overflow condition. This overflow can cause memory corruption, potentially allowing an attacker with local access to manipulate program behavior, cause crashes, or execute arbitrary code. The vulnerability requires local access with low privileges (PR:L), does not require user interaction (UI:N), and has low attack complexity (AC:L). The scope is limited to the local system, and the impact on confidentiality, integrity, and availability is low to limited (VC:L, VI:L, VA:L). The vulnerability affects raylib versions up to commit 909f040. A patch identified by commit 5a3391fdce046bc5473e52afbd835dd2dc127146 has been released to address the issue. Although a public exploit is available, there are no reports of active exploitation in the wild. The CVSS 4.8 score reflects a medium severity level, indicating that while exploitation is feasible, the impact and attack vector limit the overall risk. Organizations using raylib, particularly in local development environments or embedded systems where the library is deployed, should prioritize patching to mitigate potential risks.

For European organizations, the impact of CVE-2025-15534 is moderate but context-dependent. Since exploitation requires local access, the threat is primarily to environments where untrusted users have local system access, such as shared development workstations, build servers, or embedded devices running raylib-based applications. Successful exploitation could lead to memory corruption, causing application crashes or potentially arbitrary code execution, which may compromise system integrity and availability. Confidentiality impact is limited unless the attacker leverages the vulnerability as part of a broader attack chain. Organizations in sectors with embedded systems, software development, or multimedia applications using raylib could face operational disruptions or security breaches if the vulnerability is exploited. However, the lack of remote exploitability and no known active exploitation reduce the immediate risk. Still, failure to patch could expose organizations to insider threats or malicious local users.

To mitigate CVE-2025-15534, European organizations should: 1) Apply the official patch identified by commit 5a3391fdce046bc5473e52afbd835dd2dc127146 to update raylib to a secure version beyond 909f040. 2) Restrict local access to systems running raylib-based applications, enforcing strict user permissions and limiting untrusted user accounts. 3) Implement application whitelisting and integrity checks to detect unauthorized modifications or exploitation attempts. 4) Monitor local system logs and application behavior for anomalies indicative of exploitation attempts. 5) In development environments, ensure that build and test systems are isolated and access-controlled to prevent misuse. 6) Educate developers and system administrators about the vulnerability and the importance of timely patching. 7) For embedded systems using raylib, coordinate firmware or software updates to incorporate the patched library version. These steps go beyond generic advice by focusing on access control, monitoring, and secure update practices tailored to the vulnerability's local exploitation vector.