Out-of-bounds Read Affecting swupdate package, versions *


Severity

Recommended
low

Based on Debian security rating.

Threat Intelligence

EPSS
0.55% (44th percentile)

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  • Snyk IDSNYK-DEBIAN11-SWUPDATE-16379907
  • published4 May 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?

There is no fixed version for Debian:11 swupdate.

NVD Description

Note: Versions mentioned in the description apply only to the upstream swupdate package and not the swupdate package as distributed by Debian. See How to fix? for Debian:11 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