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[USN-8731-1] MiniUPnPd vulnerability

Posted on 07 September 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8731-1
September 07, 2026

miniupnpd vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

MiniUPnPd could be made to crash or expose sensitive information if it
received specially crafted network traffic.

Software Description:
- miniupnpd: UPnP Internet Gateway Device Daemon

Details:

It was discovered that MiniUPnPd contained an integer underflow
vulnerability in SOAPAction header parsing. A remote attacker could
use this issue to cause a denial of service or information disclosure
by sending a malformed SOAPAction header with a single quote.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
miniupnpd 2.3.9-2ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-iptables 2.3.9-2ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-nftables 2.3.9-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 24.04 LTS
miniupnpd 2.3.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-iptables 2.3.4-1ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-nftables 2.3.4-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 22.04 LTS
miniupnpd 2.2.3-1ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-iptables 2.2.3-1ubuntu0.1~esm1
Available with Ubuntu Pro
miniupnpd-nftables 2.2.3-1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 20.04 LTS
miniupnpd 2.1-6.1ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
miniupnpd 2.0.20171212-2ubuntu0.1~esm1
Available with Ubuntu Pro

Ubuntu 16.04 LTS
miniupnpd 1.8.20140523-4.1+deb9u2ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8731-1
CVE-2026-5720

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