CVE-2025-15411 identifies a memory corruption vulnerability in the WebAssembly Binary Toolkit (wabt), specifically in the function wabt::AST::InsertNode located in the wasm-decompile component. This vulnerability affects all versions from 1.0.0 through 1.0.39. The issue arises due to improper handling of node insertion in the abstract syntax tree (AST) during the decompilation process, which can corrupt memory. Exploitation requires local access with low privileges and does not require user interaction, making it a local attack vector. The vulnerability has a CVSS 4.8 (medium) score, reflecting limited impact and exploit complexity. The project currently lacks an active maintainer, and no official patches have been released, though a public exploit is available, increasing the risk of exploitation. The vulnerability could be used to cause application crashes, data corruption, or potentially escalate privileges if combined with other vulnerabilities. Given wabt's role in WebAssembly tooling, this flaw could impact developers and systems that use wasm-decompile for analyzing or transforming WebAssembly binaries. The lack of active maintenance complicates remediation, placing importance on community involvement or alternative tooling. The vulnerability does not affect remote exploitation directly but poses a risk in environments where untrusted users have local access.

The primary impact of CVE-2025-15411 is on confidentiality, integrity, and availability due to memory corruption, which can lead to application crashes or arbitrary code execution under certain conditions. Since exploitation requires local access with low privileges, the threat is mainly to systems where multiple users share access or where attackers have gained limited footholds. This vulnerability could be leveraged for local privilege escalation or to disrupt development and analysis workflows involving WebAssembly binaries. Organizations relying on wabt for security analysis, continuous integration pipelines, or WebAssembly tooling may face operational disruptions or risk of further compromise if attackers chain this vulnerability with others. The absence of an official patch increases exposure duration, potentially leading to targeted attacks in environments with lax local access controls. While no widespread exploitation is reported, the availability of a public exploit increases the likelihood of opportunistic attacks. Overall, the impact is moderate but significant in environments with shared or untrusted local users.

To mitigate CVE-2025-15411, organizations should first restrict local access to systems running wabt, ensuring only trusted users have execution privileges. Employ strict user account controls and monitor for unusual local activity that could indicate exploitation attempts. Since no official patch exists, consider auditing and applying community-contributed patches or forks that address the vulnerability. Alternatively, evaluate replacing wabt with other actively maintained WebAssembly tooling that does not exhibit this flaw. Incorporate runtime protections such as memory safety tools, sandboxing, or containerization to limit the impact of potential memory corruption. Regularly review and update local privilege management policies to minimize the risk of privilege escalation. For development environments, isolate wasm-decompile usage to dedicated, secured machines. Finally, contribute to or support the wabt project to encourage maintenance and timely vulnerability resolution.