SB2026042344 - Signed to Unsigned Conversion Error in PUPnP

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Main Vulnerability Database SB2026042344

SB2026042344 - Signed to Unsigned Conversion Error in PUPnP

Published: April 23, 2026

Security Bulletin ID SB2026042344
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Signed to Unsigned Conversion Error (CVE-ID: CVE-2026-41682)

CWE-ID: CWE-195 - Signed to Unsigned Conversion Error

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to redirect client connections to unintended ports.

The vulnerability exists due to signed to unsigned conversion error in parse_uri() when parsing port values in URIs from device descriptions or LOCATION headers. A remote attacker can supply a specially crafted out-of-range port value to redirect client connections to unintended ports.

The issue is reachable through a rogue UPnP device, SSDP spoofing, or a man-in-the-middle response.


Remediation

Install update from vendor's website.

References