# CVE-2026-5720

> Vulnerability · severity: **CRITICAL** (CVSS 9.1).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-5720
- **Published:** 2026-04-17
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.1
- **CWE codes:** CWE-125, CWE-191

## Affected products

- `miniupnp_project:miniupnpd`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-5720

## Citation

> AI Analytics. CVE-2026-5720. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-5720. Derived from NIST NVD. Licensed CC0.

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