{"id":"UBUNTU-CVE-2026-125371","details":"Tinyproxy through 1.11.3 contains an access control bypass vulnerability in acl_string_processing() in src/acl.c that compares only trailing hostname characters without checking DNS label boundaries. Attackers controlling the PTR record for their source IP, such as untrusted.net, can satisfy an 'Allow trusted.net' entry to use the proxy despite deny-by-default ACLs.","modified":"2026-11-11T09:39:22.555494083Z","published":"2026-11-10T00:00:00Z","upstream":["CVE-2026-125371"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-125371"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-125371"}],"affected":[{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-3ubuntu1","1.8.3-3ubuntu14.04.1~esm1","1.8.3-3ubuntu14.04.1~esm2","1.8.3-3ubuntu14.04.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.8.3-3ubuntu14.04.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.3-3ubuntu1","1.8.3-3ubuntu16.04.1~esm1","1.8.3-3ubuntu16.04.1~esm2","1.8.3-3ubuntu16.04.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.8.3-3ubuntu16.04.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.8.4-2","1.8.4-3","1.8.4-5","1.8.4-5ubuntu0.1~esm1","1.8.4-5ubuntu0.1~esm2","1.8.4-5ubuntu0.1~esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.8.4-5ubuntu0.1~esm3","binary_name":"tinyproxy"},{"binary_name":"tinyproxy-bin","binary_version":"1.8.4-5ubuntu0.1~esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-2","1.10.0-4","1.10.0-4ubuntu0.1","1.10.0-4ubuntu0.2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.0-4ubuntu0.2","binary_name":"tinyproxy"},{"binary_name":"tinyproxy-bin","binary_version":"1.10.0-4ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.10.0-5","1.11.0-1","1.11.0-1ubuntu0.1~esm1","1.11.0-1ubuntu0.1~esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.11.0-1ubuntu0.1~esm2"},{"binary_version":"1.11.0-1ubuntu0.1~esm2","binary_name":"tinyproxy-bin"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.1-2.1","1.11.1-3","1.11.1-3ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.11.1-3ubuntu0.1"},{"binary_name":"tinyproxy-bin","binary_version":"1.11.1-3ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.11.3-1"},{"binary_version":"1.11.3-1","binary_name":"tinyproxy-bin"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}},{"package":{"name":"tinyproxy","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/tinyproxy?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.11.2-1","1.11.2-1build1","1.11.3-1"],"ecosystem_specific":{"binaries":[{"binary_name":"tinyproxy","binary_version":"1.11.3-1"},{"binary_name":"tinyproxy-bin","binary_version":"1.11.3-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-125371.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]}