{"id":"UBUNTU-CVE-2026-18536","details":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP. The Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string. Any on-path attacker, such as open WiFi, a compromised ISP, captive portal, or a hostile egress proxy substitutes the response and thereby chooses the bytes returned by rand_bits and rand_int for every application that selected one of these sources via with_entropy_source. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.","modified":"2026-08-06T00:12:19Z","published":"2026-08-01T11:16:00Z","upstream":["CVE-2026-18536"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-18536"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-18536"},{"type":"REPORT","url":"https://lists.security.metacpan.org/cve-announce/msg/42317754/"},{"type":"REPORT","url":"https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"},{"type":"REPORT","url":"https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"},{"type":"REPORT","url":"https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"},{"type":"REPORT","url":"https://security.metacpan.org/docs/guides/random-data-for-security.html"},{"type":"REPORT","url":"http://www.openwall.com/lists/oss-security/2026/08/01/8"}],"affected":[{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.007-3","binary_name":"libdata-entropy-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}},{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"],"ecosystem_specific":{"binaries":[{"binary_name":"libdata-entropy-perl","binary_version":"0.007-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}},{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.007-3","binary_name":"libdata-entropy-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}},{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3.1"],"ecosystem_specific":{"binaries":[{"binary_name":"libdata-entropy-perl","binary_version":"0.007-3.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}},{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.007-4","binary_name":"libdata-entropy-perl"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}},{"package":{"name":"libdata-entropy-perl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.008-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libdata-entropy-perl","binary_version":"0.008-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}