CVE-2026-18536
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP
Description
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.
INFO
Published Date :
Aug. 1, 2026, 11:16 a.m.
Last Modified :
Aug. 7, 2026, 6:52 p.m.
Remotely Exploit :
Yes !
Source :
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update the Data::Entropy Perl module to a secure version.
- Ensure remote entropy sources use secure transport (HTTPS).
- Verify integrity checks are robust.
- Disable vulnerable entropy sources if update is not possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-18536.
| URL | Resource |
|---|---|
| https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv | Vendor Advisory |
| https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS | Release Notes |
| https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes | Release Notes |
| https://security.metacpan.org/docs/guides/random-data-for-security.html | Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2026/08/01/8 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-18536 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-18536
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-18536 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-18536 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 07, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:rrwo:data::entropy:*:*:*:*:*:perl:*:* versions up to (excluding) 0.010 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/08/01/8 Types: Mailing List, Third Party Advisory Added Reference Type CPANSec: https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv Types: Vendor Advisory Added Reference Type CPANSec: https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS Types: Release Notes Added Reference Type CPANSec: https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes Types: Release Notes Added Reference Type CPANSec: https://security.metacpan.org/docs/guides/random-data-for-security.html Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added SSVC {'id': 'CVE-2026-18536', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-03T19:55:08.843137Z'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Aug. 01, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/08/01/8 -
New CVE Received by 9b29abf9-4ab0-4765-b253-1875cd9b441e
Aug. 01, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/robrwo/Data-Entropy', 'vendor': 'RRWO', 'product': 'Data::Entropy', 'versions': [{'status': 'affected', 'version': '0', 'lessThan': '0.010', 'versionType': 'custom'}], 'packageName': 'Data-Entropy', 'programFiles': ['lib/Data/Entropy/RawSource/RandomOrg.pm', 'lib/Data/Entropy/RawSource/RandomnumbersInfo.pm'], 'collectionURL': 'https://cpan.org/modules', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': 'Data::Entropy::RawSource::RandomOrg::_checkbuf'}, {'name': 'Data::Entropy::RawSource::RandomOrg::_ensure_buffer'}, {'name': 'Data::Entropy::RawSource::RandomnumbersInfo::_ensure_buffer'}]}] Added Description 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. Added CWE CWE-319 Added CWE CWE-353 Added Reference https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv Added Reference https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS Added Reference https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes Added Reference https://security.metacpan.org/docs/guides/random-data-for-security.html