{"id":"CVE-2026-5720","title":"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","summary":"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. Attacker…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cwe":["CWE-125","CWE-191"],"published":"2026-04-17","updated":"2026-06-29","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-5720","references":[{"url":"https://github.com/miniupnp/miniupnp/","label":"disclosure@vulncheck.com"},{"url":"https://github.com/miniupnp/miniupnp/commit/f56bd09b2f2650126b832c5f30a65a09e28167fa","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/miniupnpd-integer-underflow-soapaction-header-parsing","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"epss":0.00674,"epssPercentile":0.50712,"ingestedAt":"2026-06-29T14:29:18.063Z","slug":"CVE-2026-5720","body":"## Overview\n\nminiupnpd 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}