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.
Affected products
rrwo: data\
References5
- github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rc… Vendor Advisory
- metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entr… Release Notes
- metacpan.org/release/RRWO/Data-Entropy-0.010/changes Release Notes
- security.metacpan.org/docs/guides/random-data-for-security.html Third Party Advisory
- www.openwall.com/lists/oss-security/2026/08/01/8 Mailing ListThird Party Advisory
Metrics
- CVSS 3.1
-
7.5
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - EPSS — exploit probability
- 0% percentile: 10 · as of 13 November 2026
- CWE
- CWE-319CWE-353
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.