{"id":"CVE-2026-18536","aliases":["DEBIAN-CVE-2026-18536","EUVD-2026-51803","GHSA-845w-rcqw-jwvv","UBUNTU-CVE-2026-18536"],"status":"published","title":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP","description":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny 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.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00204,"percentile":0.10452,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-319","CWE-353"],"published":"2026-08-01T10:35:38Z","modified":"2026-10-28T02:30:25Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-4","0.007-4+deb12u1","0.008-1"]},{"source":"osv","ecosystem":"Debian:13","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.008-1"]},{"source":"osv","ecosystem":"Debian:14","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.008-1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-3.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.007-4"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.008-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"libdata-entropy-perl","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.008-1"]}],"products":[{"vendor":"rrwo","product":"data::entropy"},{"vendor":"rrwo","product":"data\\"},{"vendor":"zefram","product":"data::entropy"}],"references":[{"url":"https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv","tags":["vendor-advisory","Vendor Advisory","advisory","report"]},{"url":"https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes","tags":["release-notes","Release Notes","advisory","report"]},{"url":"https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS","tags":["Release Notes","web","report"]},{"url":"https://security.metacpan.org/docs/guides/random-data-for-security.html","tags":["technical-description","Third Party Advisory","article","report"]},{"url":"http://www.openwall.com/lists/oss-security/2026/08/01/8","tags":["Mailing List","Third Party Advisory","web","report"]},{"url":"https://cpan.org/modules","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/18xxx/CVE-2026-18536.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18536","tags":["advisory"]},{"url":"https://github.com/robrwo/Data-Entropy","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-18536","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-18536","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18536","tags":["report"]},{"url":"https://lists.security.metacpan.org/cve-announce/msg/42317754/","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-18536","title":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP","description":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny 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.","status":"published","published":"2026-08-01T10:35:38.392Z","modified":"2026-08-03T19:55:35.372Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"adp"}],"cwes":["CWE-319","CWE-353"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-51803","description":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny 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.","status":"published","published":"2026-08-01T10:35:38Z","modified":"2026-08-03T19:55:35Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T18:02:23.68186Z"}],"nvd":[{"id":"CVE-2026-18536","description":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny 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.","status":"published","published":"2026-08-01T11:16:38.483Z","modified":"2026-10-23T23:10:00.157Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-319","CWE-353"],"updated_at":"2026-11-02T14:12:34.290716Z"}],"osv":[{"id":"CVE-2026-18536","title":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP","description":"Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\n\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\n\nAny 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.","status":"published","published":"2026-08-01T10:35:38.392Z","modified":"2026-10-28T02:30:25.880135731Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-319","CWE-353"],"updated_at":"2026-11-02T15:44:58.024074Z"},{"id":"DEBIAN-CVE-2026-18536","description":"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.","status":"published","published":"2026-08-01T11:16:38.483Z","modified":"2026-10-24T09:47:24.274588441Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:53.097669Z"},{"id":"UBUNTU-CVE-2026-18536","description":"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.","status":"published","published":"2026-08-01T11:16:00Z","modified":"2026-10-17T12:56:47.250867426Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:01.334185Z"}]}}