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CVE-2026-18549 is a resource management flaw in @fastify/multipart, a multipart form-data parser for Fastify. Affected versions are 5.3.0 through 10.1.0. When a multipart upload hits the busboy fileSize limit and the file part is truncated, the plugin clears its internal reference to the current file even though the underlying stream remains open. If the client then aborts the connection before the terminating multipart boundary is sent, the abort-handling cleanup path cannot find and destroy the still-open stream. As a result, saveRequestFiles() does not settle, the associated request handler remains hung, and the temporary file already created on disk is not removed. Repeated exploitation can accumulate orphaned temporary files and suspended request executions.
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Cross-references every affected SKU, including bundled OEM variants.
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