Out-of-bounds Read Affecting swupdate package, versions <2022.12+dfsg-4+deb12u2


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.55% (44th percentile)

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  • Snyk IDSNYK-ECHOLATEST-SWUPDATE-20877406
  • published13 Oct 2026
  • disclosed23 Apr 2026

Introduced: 23 Apr 2026

CVE-2026-28525  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-191  (opens in a new tab)

How to fix?

Upgrade Echo:latest swupdate to version 2022.12+dfsg-4+deb12u2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream swupdate package and not the swupdate package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

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 Base Scores

version 3.1