UBUNTU-CVE-2026-18536

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Source
https://ubuntu.com/security/CVE-2026-18536
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-18536.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-18536
Upstream
Published
2026-08-01T11:16:00Z
Modified
2026-08-06T00:12:19Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
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 randbits and randint for every application that selected one of these sources via withentropysource. The _checkbuf method response is equally attacker-controlled, so the retry/sleep behaviour is steerable too.

References

Affected packages

Ubuntu:16.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
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"
Ubuntu:18.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
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"
Ubuntu:20.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
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"
Ubuntu:22.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.007-3.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.007-3.1",
            "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"
Ubuntu:24.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
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"
Ubuntu:26.04:LTS
libdata-entropy-perl

Package

Name
libdata-entropy-perl
Purl
pkg:deb/ubuntu/libdata-entropy-perl?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.008-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "0.008-1",
            "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"