Bug 2514600

Summary:	CVE-2026-18536 perl-Data-Entropy: Data-Entropy: Predictable random numbers due to unencrypted remote entropy sources [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Samuele Negrini <snegrini>
Component:	perl-Data-Entropy	Assignee:	Emmanuel Seyman <emmanuel>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	high
Version:	rawhide	CC:	emmanuel, perl-devel
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["77c308bd-4de2-4778-8060-19d646a0894d"]}
Fixed In Version:	perl-Data-Entropy-0.010-1.fc45 perl-Data-Entropy-0.010-1.fc44 perl-Data-Entropy-0.010-1.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-09-15 00:17:20 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2509968

Description Samuele Negrini 2026-08-12 13:27:39 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-09-06 15:46:15 UTC

FEDORA-2026-8924ee53fe (perl-Data-Entropy-0.010-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8924ee53fe

Comment 2 Fedora Update System 2026-09-06 15:46:16 UTC

FEDORA-2026-2c6e5be623 (perl-Data-Entropy-0.010-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-2c6e5be623

Comment 3 Fedora Update System 2026-09-07 01:09:36 UTC

FEDORA-2026-f234be41fe has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-f234be41fe`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f234be41fe

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-09-07 01:23:39 UTC

FEDORA-2026-2c6e5be623 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-2c6e5be623`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-2c6e5be623

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-07 01:42:48 UTC

FEDORA-2026-8924ee53fe has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-8924ee53fe`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8924ee53fe

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-15 00:17:20 UTC

FEDORA-2026-f234be41fe (perl-Data-Entropy-0.010-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-09-15 00:41:12 UTC

FEDORA-2026-2c6e5be623 (perl-Data-Entropy-0.010-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-09-15 01:03:36 UTC

FEDORA-2026-8924ee53fe (perl-Data-Entropy-0.010-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.