{"id":"UBUNTU-CVE-2026-5720","details":"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.","modified":"2026-09-07T19:00:03.753300993Z","published":"2026-04-17T22:16:00Z","related":["USN-8731-1"],"upstream":["CVE-2026-5720"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-5720"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-5720"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8731-1"}],"affected":[{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.8.20140523-4.1+deb9u2ubuntu0.1~esm1"}]}],"versions":["1.8.20140523-4","1.8.20140523-4.1+deb9u1build0.16.04.1","1.8.20140523-4.1+deb9u2build0.16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"miniupnpd","binary_version":"1.8.20140523-4.1+deb9u2ubuntu0.1~esm1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.0.20171212-2ubuntu0.1~esm1"}]}],"versions":["1.8.20140523-4.1","1.8.20140523-4.2","2.0.20171212-1","2.0.20171212-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.20171212-2ubuntu0.1~esm1","binary_name":"miniupnpd"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1-6.1ubuntu0.1~esm1"}]}],"versions":["2.1-6ubuntu2","2.1-6.1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.1-6.1ubuntu0.1~esm1","binary_name":"miniupnpd"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.3-1ubuntu0.1~esm1"}]}],"versions":["2.2.1-1","2.2.3-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_version":"2.2.3-1ubuntu0.1~esm1","binary_name":"miniupnpd"},{"binary_version":"2.2.3-1ubuntu0.1~esm1","binary_name":"miniupnpd-iptables"},{"binary_name":"miniupnpd-nftables","binary_version":"2.2.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.4-1ubuntu0.1~esm1"}]}],"versions":["2.3.3-1","2.3.4-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"miniupnpd","binary_version":"2.3.4-1ubuntu0.1~esm1"},{"binary_name":"miniupnpd-iptables","binary_version":"2.3.4-1ubuntu0.1~esm1"},{"binary_name":"miniupnpd-nftables","binary_version":"2.3.4-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.7-2","2.3.9-2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.3.9-2","binary_name":"miniupnpd"},{"binary_name":"miniupnpd-iptables","binary_version":"2.3.9-2"},{"binary_name":"miniupnpd-nftables","binary_version":"2.3.9-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}},{"package":{"name":"miniupnpd","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/miniupnpd?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.3.9-2ubuntu0.1~esm1"}]}],"versions":["2.3.9-2","2.3.9-2build1"],"ecosystem_specific":{"binaries":[{"binary_name":"miniupnpd","binary_version":"2.3.9-2ubuntu0.1~esm1"},{"binary_name":"miniupnpd-iptables","binary_version":"2.3.9-2ubuntu0.1~esm1"},{"binary_version":"2.3.9-2ubuntu0.1~esm1","binary_name":"miniupnpd-nftables"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-5720.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}