{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18536", "assignerOrgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "state": "PUBLISHED", "assignerShortName": "CPANSec", "dateReserved": "2026-07-31T20:31:42.315Z", "datePublished": "2026-08-01T10:35:38.392Z", "dateUpdated": "2026-08-03T19:55:35.372Z"}, "containers": {"cna": {"affected": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Data-Entropy", "product": "Data::Entropy", "programFiles": ["lib/Data/Entropy/RawSource/RandomOrg.pm", "lib/Data/Entropy/RawSource/RandomnumbersInfo.pm"], "programRoutines": [{"name": "Data::Entropy::RawSource::RandomOrg::_checkbuf"}, {"name": "Data::Entropy::RawSource::RandomOrg::_ensure_buffer"}, {"name": "Data::Entropy::RawSource::RandomnumbersInfo::_ensure_buffer"}], "repo": "https://github.com/robrwo/Data-Entropy", "vendor": "RRWO", "versions": [{"lessThan": "0.010", "status": "affected", "version": "0", "versionType": "custom"}]}], "descriptions": [{"lang": "en", "value": "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."}], "problemTypes": [{"descriptions": [{"cweId": "CWE-319", "description": "CWE-319 Cleartext Transmission of Sensitive Information", "lang": "en", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-353", "description": "CWE-353 Missing Support for Integrity Check", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "shortName": "CPANSec", "dateUpdated": "2026-08-01T10:35:38.392Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"}, {"tags": ["release-notes"], "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"}, {"url": "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"}, {"tags": ["technical-description"], "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"}], "source": {"discovery": "UNKNOWN"}, "title": "Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP", "workarounds": [{"lang": "en", "value": "Deployments should not use the RandomOrg or RandomnumbersInfo sources, as these are flawed.\n\nThey have been removed from Data::Entropy 0.010. (There was a change to use HTTPS to connect to these sources in version 0.009 that did not work.)\n\nNote that Data::Entropy has been deprecated since version 0.008. Users are advised to migrate to alternative solutions that use system sources of random data, such as Crypt::SysRandom, Crypt::URandom or Crypt::PRNG."}], "x_generator": {"engine": "cpansec-cna-tool 0.1"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/08/01/8"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-08-01T15:23:24.896Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-08-03T19:55:08.843137Z", "id": "CVE-2026-18536", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-03T19:55:35.372Z"}}]}}

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{"affected": [{"affectedData": [{"collectionURL": "https://cpan.org/modules", "defaultStatus": "unaffected", "packageName": "Data-Entropy", "product": "Data::Entropy", "programFiles": ["lib/Data/Entropy/RawSource/RandomOrg.pm", "lib/Data/Entropy/RawSource/RandomnumbersInfo.pm"], "programRoutines": [{"name": "Data::Entropy::RawSource::RandomOrg::_checkbuf"}, {"name": "Data::Entropy::RawSource::RandomOrg::_ensure_buffer"}, {"name": "Data::Entropy::RawSource::RandomnumbersInfo::_ensure_buffer"}], "repo": "https://github.com/robrwo/Data-Entropy", "vendor": "RRWO", "versions": [{"lessThan": "0.010", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rrwo:data\\:\\:entropy:*:*:*:*:*:perl:*:*", "matchCriteriaId": "8B313D17-8332-4B6B-9F48-3655144D7D19", "versionEndExcluding": "0.010", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-18536", "lastModified": "2026-08-07T18:52:30.823", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-18536", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-03T19:55:08.843137Z", "version": "2.0.3"}}]}, "published": "2026-08-01T11:16:38.483", "references": [{"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Vendor Advisory"], "url": "https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Release Notes"], "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Release Notes"], "url": "https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes"}, {"source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "tags": ["Third Party Advisory"], "url": "https://security.metacpan.org/docs/guides/random-data-for-security.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/08/01/8"}], "sourceIdentifier": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-319"}, {"lang": "en", "value": "CWE-353"}], "source": "9b29abf9-4ab0-4765-b253-1875cd9b441e", "type": "Secondary"}]}

{"bugzilla": {"description": "Data-Entropy: Data-Entropy: Predictable random numbers due to unencrypted remote entropy sources", "id": "2509968", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509968"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-319", "details": ["Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP.\nThe Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo remote sources are accessed over plain HTTP.\nThe Data::Entropy::RawSource::RandomOrg integrity check trivially matches any non-empty byte string.\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.", "A flaw was found in Data-Entropy. This component reads remote entropy (randomness) sources over unencrypted HTTP. An on-path attacker, such as one on an open Wi-Fi network or a compromised internet service provider (ISP), can intercept and alter the responses from these sources. This allows the attacker to control the random bytes generated by the application, leading to predictable random numbers. Such a compromise of cryptographic randomness can have significant security implications, potentially enabling further attacks."], "mitigation": {"lang": "en:us", "value": "Deployments should not use the RandomOrg or RandomnumbersInfo sources, as these are flawed.\nThey have been removed from Data::Entropy 0.010. (There was a change to use HTTPS to connect to these sources in version 0.009 that did not work.)\nNote that Data::Entropy has been deprecated since version 0.008. Users are advised to migrate to alternative solutions that use system sources of random data, such as Crypt::SysRandom, Crypt::URandom or Crypt::PRNG."}, "name": "CVE-2026-18536", "public_date": "2026-08-01T10:35:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-18536\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-18536\nhttps://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv\nhttps://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS\nhttps://metacpan.org/release/RRWO/Data-Entropy-0.010/changes\nhttps://security.metacpan.org/docs/guides/random-data-for-security.html"], "statement": "This Important flaw in `perl-Data-Entropy` allows an on-path attacker to manipulate random number generation by intercepting unencrypted HTTP requests to specific remote entropy sources. This can lead to predictable values in applications configured to use these insecure sources, compromising cryptographic randomness and potentially leading to severe security vulnerabilities.\nNote that Data::Entropy has been deprecated since version 0.008. Users are advised to migrate to alternative solutions that use system sources of random data, such as Crypt::SysRandom, Crypt::URandom or Crypt::PRNG.", "threat_severity": "Important"}