Out-of-bounds Read Affecting miniupnpd package, versions <2.1-6.1ubuntu0.1~esm1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.67% (52nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-MINIUPNPD-16112282
  • published4 Sept 2026
  • disclosed17 Apr 2026

Introduced: 17 Apr 2026

CVE-2026-5720  (opens in a new tab)
CWE-125  (opens in a new tab)
CWE-191  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 miniupnpd to version 2.1-6.1ubuntu0.1~esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream miniupnpd package and not the miniupnpd package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

miniupnpd contains an integer underflow vulnerability in SOAPAction header parsing that allows remote attackers to cause a denial of service or information disclosure by sending a malformed SOAPAction header with a single quote. Attackers can trigger an out-of-bounds memory read by exploiting improper length validation in ParseHttpHeaders(), where the parsed length underflows to a large unsigned value when passed to memchr(), causing the process to scan memory far beyond the allocated HTTP request buffer.

CVSS Base Scores

version 3.1