Signed to Unsigned Conversion Error in PUPnP - CVE-2026-41682
Published: April 23, 2026
Vulnerability identifier: #VU126928
CSH Severity: Medium
CVSS v4.0: 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
CVE-ID: CVE-2026-41682
CWE-ID: CWE-195
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: pupnp
Affected software:
PUPnP
PUPnP
Detailed vulnerability description
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.
How to mitigate CVE-2026-41682
Install security update from vendor's website.