CVE-2026-28525

CVE-2026-28525 · SWUpdate Integer Underflow in Multipart Upload Parser

This page contains facts from public vulnerability sources. Check the original advisory before updating.

SWUpdate contains an integer underflow vulnerability in the multipart upload parser in mongoose_multipart.c that allows unauthenticated attackers to cause a denial of service by sending a crafted HTTP POST request to /upload with a malformed multipart boundary and controlled TCP stream timing. Attackers can trigger an integer underflow in the mg_http_multipart_continue_wait_for_chunk() function when the buffer length falls within a specific range, causing an out-of-bounds heap read past the allocated receive buffer to a local IPC socket.

CVSS 8.2 · High · EPSS 0.3% · Fix available

Published

2026-04-23T20:59:31.492Z

Updated

2026-07-28T01:48:29.666Z

Stack: system

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