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Vulnerability record · CVE-2026-5720 · published 17 April 2026

CVE-2026-5720: Miniupnp project miniupnpd out-of-bounds read vulnerability

MMiniupnp Project · Miniupnpd

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.

7.1 CVSS 4.0 High EPSS 1.1% · top 36.5% CWE-125 · Out-of-bounds readCWE-191 · CWE-191
7.1CVSS 4.0 base score
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
29 Jun 2026Last modified by NVD

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:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/miniupnp/miniupnp/ Product
https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa Patch
https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2013-0230MiniUPnPd SOAPAction handler stack buffer overflowMiniUPnPd 1.0 contains a stack-based buffer overflow in the ExecuteSoapAction function of its HTTP SOAPAction handler. A long quoted method string ov…EPSS 69%analysed9.8CVE-2017-8798Miniupnp project miniupnpd memory buffer overflow vulnerabilityInteger signedness error in MiniUPnP MiniUPnPc v1.4.20101221 through v2.0 allows remote attackers to cause a denial of service or possibly have unspe…EPSS 24%7.8CVE-2017-1000494Miniupnp project miniupnpd memory buffer overflow vulnerabilityUninitialized stack variable vulnerability in NameValueParserEndElt (upnpreplyparse.c) in miniupnpd < 2.0 allows an attacker to cause Denial of Servi…EPSS 0.47%7.8CVE-2013-0229MiniUPnPd SSDP handler buffer over-read crashes serviceThe ProcessSSDPRequest function in minissdp.c in MiniUPnPd before 1.4 mishandles a crafted SSDP request, triggering a buffer over-read that crashes t…EPSS 76%analysed7.8CVE-2013-1461Miniupnp project miniupnpd vulnerabilityThe ExecuteSoapAction function in the SOAPAction handler in the HTTP service in MiniUPnP MiniUPnPd 1.0 allows remote attackers to cause a denial of s…EPSS 2.8%7.8CVE-2013-1462Miniupnp project miniupnpd vulnerabilityInteger signedness error in the ExecuteSoapAction function in the SOAPAction handler in the HTTP service in MiniUPnP MiniUPnPd 1.0 allows remote atta…EPSS 1.8%7.5CVE-2013-2600Miniupnp project miniupnpd information exposure vulnerabilityMiniUPnPd has information disclosure use of snprintf()EPSS 2.3%7.5CVE-2019-12106Miniupnp project miniupnpd use after free vulnerabilityThe updateDevice function in minissdpd.c in MiniUPnP MiniSSDPd 1.4 and 1.5 allows a remote attacker to crash the process due to a Use After Free vuln…EPSS 2.8%

Source: NIST National Vulnerability Database (record CVE-2026-5720), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.