CVE-2026-5720

UNKNOWN 0.0

miniupnpd Integer Underflow SOAPAction Header Parsing

CVSS Score

0.0

EPSS Score

0.1%

EPSS Percentile

19th

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.

CWE	CWE-191 CWE-125
Vendor	miniupnp project
Product	miniupnpd
Published	Apr 17, 2026
Last Updated	May 4, 2026

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Affected Versions

miniupnp project / miniupnpd

0 < 2.3.10

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/miniupnp/miniupnp/ github.com: https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa vulncheck.com: https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing

Credits

Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.