by Kastro
Paper/Archive/CVE-2026-5720

CVE-2026-5720

miniupnp project miniupnpd — miniupnpd Integer Underflow SOAPAction Header Parsing

EPSS 0.7%CVSS 9.1
critical.is priorityof 100
38
CVSS 9.1 (NVD)9.1 / 10 × 3027.3Not in CISA KEV+300.0EPSS percentile 52.1.521 × 2010.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
miniupnpd< 2.3.102.3.10CNA

Scores by source

NVD9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
VulnCheck (CNA)7.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/miniupnp/miniupnppatchgithub.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fawriteupvulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing