{"id":"UBUNTU-CVE-2026-115822","details":"Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies. Starman decodes chunked request bodies before calling the application, matching each chunk-size line with `s/^(([0-9a-fA-F]+).*\\015\\012)//`. A line of hex digits followed by a bare LF and then CRLF never matches, because `.` does not match LF, and each failed attempt backtracks in time quadratic in the length of the hex run. Nothing limits the length of the line. A remote attacker can exhaust worker CPU by sending such requests to any route.","modified":"2026-10-27T04:17:49.601649078Z","published":"2026-10-26T00:00:00Z","upstream":["CVE-2026-115822"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-115822"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-115822"},{"type":"REPORT","url":"https://github.com/miyagawa/Starman/commit/0f33f9b132b5e410d6cce722ff71988e22476acf.patch"},{"type":"REPORT","url":"https://metacpan.org/release/MIYAGAWA/Starman-0.4019/changes"}],"affected":[{"package":{"name":"starman","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4014-1","binary_name":"starman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-1"],"ecosystem_specific":{"binaries":[{"binary_name":"starman","binary_version":"0.4014-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4014-3","0.4015-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4015-1","binary_name":"starman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4015-1"],"ecosystem_specific":{"binaries":[{"binary_name":"starman","binary_version":"0.4015-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4016-1","0.4017-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4017-1","binary_name":"starman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/starman?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4017-1build1","0.4018-1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4018-1","binary_name":"starman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}},{"package":{"name":"starman","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/starman?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4017-1","0.4017-1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.4017-1build1","binary_name":"starman"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-115822.json"}}],"schema_version":"1.9.2","severity":[{"type":"Ubuntu","score":"medium"}]}