---
id: CVE-2026-18536
title: >-
  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::En…
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::En…
severity: none
cwe:
  - CWE-319
  - CWE-353
published: '2026-08-01'
updated: '2026-08-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18536'
references:
  - url: >-
      https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: >-
      https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'https://security.metacpan.org/docs/guides/random-data-for-security.html'
    label: 9b29abf9-4ab0-4765-b253-1875cd9b441e
  - url: 'http://www.openwall.com/lists/oss-security/2026/08/01/8'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
ingestedAt: '2026-08-02T05:17:48.718Z'
epss: 0.00155
epssPercentile: 0.03858
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.