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CVE-2026-5720

Miniupnp Project Miniupnpd out-of-bounds read

9.1 CRITICALEPSS 1.07%
  1. Published17 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Miniupnp Project Miniupnpd< 2.3.10

Remediation

Fixed in
Miniupnp Project Miniupnpd≥ 2.3.10

References

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Frequently asked

Is CVE-2026-5720 being actively exploited?

CVE-2026-5720 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.07%.

How severe is CVE-2026-5720?

CVE-2026-5720 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.07% probability of exploitation.

Which products are affected by CVE-2026-5720?

Affected products include Miniupnp Project Miniupnpd.

How do I fix CVE-2026-5720?

Upgrade affected software to a fixed version, for example Miniupnp Project Miniupnpd 2.3.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-5720 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.