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

Quick assessment

Affected
sbabic swupdate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SWUpdate是Stefano Babic个人开发者的一个嵌入式Linux系统更新工具。 SWUpdate存在缓冲区错误漏洞，该漏洞源于mongoose_multipart.c中多部分上传解析器的整数下溢，允许未经身份验证的攻击者通过发送特制HTTP POST请求到/upload导致拒绝服务。

CVSS 6.8 · Medium EPSS 0.32% · P24

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
sbabic swupdate ≤ 2025.12 affected
beee2dc0feef1cfe84f1aa6fc980e104b2e47a74 unaffected
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I. Basic Information for CVE-2026-28525

Vulnerability Information
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Vulnerability Title
SWUpdate Integer Underflow in Multipart Upload Parser
Source: CVE Program / CVE List V5
Vulnerability 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 past the allocated receive buffer to a local IPC socket.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5
Vulnerability Title
SWUpdate 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SWUpdate是Stefano Babic个人开发者的一个嵌入式Linux系统更新工具。 SWUpdate存在缓冲区错误漏洞，该漏洞源于mongoose_multipart.c中多部分上传解析器的整数下溢，允许未经身份验证的攻击者通过发送特制HTTP POST请求到/upload导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
sbabic swupdate 0 ~ 2025.12 -

II. Public POCs for CVE-2026-28525

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III. Intelligence Information for CVE-2026-28525

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IV. Related Vulnerabilities

Same product: swupdate
Same vendor: sbabic
Same weakness: CWE-191

V. Comments for CVE-2026-28525

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