CVE-2026-18536
Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP
- State
- Published
- Severity
- 7.5 High
- Published
- Aug 1, 2026
- Updated
- Aug 3, 2026
- Reserved
- Jul 31, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | CISA-ADP |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Data::EntropyRRWO |
|
References
- https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvvvendor-advisory
- https://metacpan.org/release/RRWO/Data-Entropy-0.010/changesrelease-notes
- https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS
- https://security.metacpan.org/docs/guides/random-data-for-security.htmltechnical-description
- http://www.openwall.com/lists/oss-security/2026/08/01/8
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