CVE-2026-5720CRITICAL 9.1EPSS p47.3%

CVE-2026-5720CVE-2026-5720

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
EPSS0.67% probability of exploitation · percentile 47.3% · 2026-06-18T12:00:27Z
Published2026-04-17
Last modified2026-05-11

Underlying weaknesses· 2

CWE-125CWE-191

References

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

2

TypeTargetConfidenceTier
WeaknessOut-of-bounds Readcwe-1250%live
WeaknessInteger Underflow (Wrap or Wraparound)cwe-1910%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.