SWUpdate Integer Underflow in Multipart Upload Parser_CVE-2026-28525

8.2 / 10

HIGH

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Description

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 that writes data beyond the allocated receive buffer to a local IPC socket.

Basic Information

ID CVE-2026-28525

Source VulnCheck

Published Apr 23, 2026 at 20:59

Affected Product

Vendor sbabic

Product swupdate

Affected Versions sbabic swupdate 0

CWE Classification

CWE-191 CWE-125

References

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    "published": "2026-04-23T20:59:31.492Z",
    "modified": "2026-04-23T20:59:31.492Z",
    "type": "cve",
    "title": "SWUpdate Integer Underflow in Multipart Upload Parser",
    "source": "VulnCheck",
    "references": "https://github.com/sbabic/swupdate/commit/beee2dc0feef1cfe84f1aa6fc980e104b2e47a74\nhttps://www.vulncheck.com/advisories/swupdate-integer-underflow-in-multipart-upload-parser",
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