High
libdata-entropy-perl — security advisory
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.
- Products
- libdata-entropy-perl
- Affected versions
- 0.007-3, 0.007-3.1, 0.007-4, 0.008-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-18536
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:24 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-18536
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
libdata-entropy-perl
Fixed versions: Not specified
Complete source record
{
"id": "fad3e7eaf920cd8b90609363b15878f5ba410fa7d144ab98475fd92a96e66047",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-18536",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-18536",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-18536",
"products": [
{
"name": {
"value": "libdata-entropy-perl",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.007-3",
"evidence": "/affected/0/versions"
}
]
},
{
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{
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{
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"affected_versions": [
{
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}
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{
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"evidence": "/affected/4/package/name"
},
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"fixed_versions": [],
"affected_versions": [
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"evidence": "/affected/4/versions"
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]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/5/versions"
}
]
},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.008-1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-18536",
"aliases": [
"UBUNTU-CVE-2026-18536"
],
"metrics": [
{
"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"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.007-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libdata-entropy-perl",
"binary_version": "0.007-3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
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],
"package": {
"name": "libdata-entropy-perl",
"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"0.007-3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"
},
"ecosystem_specific": {
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{
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"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
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{
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],
"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"0.007-3.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"
},
"ecosystem_specific": {
"binaries": [
{
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"0.007-4"
],
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"0.008-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libdata-entropy-perl",
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"0.008-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libdata-entropy-perl",
"binary_version": "0.008-1"
}
]
}
}
],
"modified": "2026-10-17T12:56:47.250867426Z",
"provider": "osv",
"upstream": [
"CVE-2026-18536"
],
"references": [
"https://ubuntu.com/security/CVE-2026-18536",
"https://www.cve.org/CVERecord?id=CVE-2026-18536",
"https://lists.security.metacpan.org/cve-announce/msg/42317754/",
"https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv",
"https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS",
"https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes",
"https://security.metacpan.org/docs/guides/random-data-for-security.html"
]
},
"related_cves": [
{
"value": "CVE-2026-18536",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 356254,
"published_at": "2026-08-01T11:16:00+00:00"
}