CVE-2026-3393 identifies a heap-based buffer overflow vulnerability in the SoLoud audio library, specifically in the function SoLoud::Wav::loadflac located in src/audiosource/wav/soloud_wav.cpp. This function handles FLAC audio file loading within the Wav audio source component. The vulnerability arises from improper handling of input data leading to a heap overflow condition. An attacker with local access and low privileges can exploit this flaw by manipulating the input to the loadflac function, causing memory corruption. This can result in application crashes or potentially arbitrary code execution if exploited successfully. The vulnerability affects SoLoud version 20200207 and earlier. The exploit does not require user interaction, but it does require local access and privileges. The vulnerability was responsibly disclosed via an issue report, but the vendor has not yet issued a patch or response. The CVSS 4.0 base score is 4.8, reflecting medium severity due to the local attack vector and limited scope. No known exploits are currently observed in the wild. The vulnerability impacts the confidentiality, integrity, and availability of applications using the affected SoLoud version, particularly those processing FLAC audio files.

The primary impact of CVE-2026-3393 is the potential for heap-based memory corruption in applications using the vulnerable SoLoud version. This can lead to application crashes, denial of service, or in the worst case, arbitrary code execution if an attacker can carefully craft input data. Since exploitation requires local access and low privileges, remote exploitation is not feasible, limiting the threat scope. However, in environments where untrusted users have local access, such as shared workstations, development machines, or multi-user systems, the risk increases. Applications embedding SoLoud for audio processing, especially those handling FLAC files, may be vulnerable to targeted attacks. The lack of a vendor patch increases exposure duration. Organizations relying on SoLoud in multimedia, gaming, or audio processing software could face stability issues or security breaches if exploited. The medium CVSS score reflects moderate risk, but the absence of known exploits reduces immediate threat urgency.

1. Immediately audit all software and systems to identify usage of SoLoud version 20200207 or earlier. 2. Where possible, restrict local access to trusted users only, minimizing the risk of local exploitation. 3. Implement application-level sandboxing or process isolation for software using SoLoud to contain potential exploitation impact. 4. Monitor system and application logs for unusual crashes or behavior related to audio processing. 5. If source code is available, consider applying manual code review and patching the loadflac function to validate input sizes and prevent buffer overflows. 6. Engage with the SoLoud project or community to track patch releases and apply updates promptly once available. 7. For critical systems, consider temporarily disabling FLAC audio processing or replacing SoLoud with alternative audio libraries until a fix is released. 8. Educate local users about the risk of running untrusted audio files or applications that may trigger the vulnerability.