CVE-2026-28525
Medium · 6.8CVSS
6.8
EPSS
0.5%
Published
Apr 23, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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