https://bugzilla.redhat.com/show_bug.cgi?id=2514598
Bug ID: 2514598
Summary: CVE-2026-18536 perl-Data-Entropy: Data-Entropy:
Predictable random numbers due to unencrypted remote
entropy sources [epel-all]
Product: Fedora EPEL
Version: epel10
Status: NEW
Whiteboard: {"flaws": ["77c308bd-4de2-4778-8060-19d646a0894d"]}
Component: perl-Data-Entropy
Keywords: Security, SecurityTracking
Severity: high
Priority: high
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected]
Blocks: 2509968 (CVE-2026-18536)
Target Milestone: ---
Classification: Fedora
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.
Referenced Bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=2509968
[Bug 2509968] CVE-2026-18536 Data-Entropy: Data-Entropy: Predictable random
numbers due to unencrypted remote entropy sources
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