======================================================================== CVE-2026-18536 CPAN Security Group ======================================================================== CVE ID: CVE-2026-18536 Distribution: Data-Entropy Versions: before 0.010 MetaCPAN: https://metacpan.org/dist/Data-Entropy VCS Repo: https://github.com/robrwo/Data-Entropy 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. Problem types ------------- - CWE-319 Cleartext Transmission of Sensitive Information - CWE-353 Missing Support for Integrity Check Workarounds ----------- Deployments should not use the RandomOrg or RandomnumbersInfo sources, as these are flawed. They have been removed from Data::Entropy 0.010. (There was a change to use HTTPS to connect to these sources in version 0.009 that did not work.) Note that Data::Entropy has been deprecated since version 0.008. Users are advised to migrate to alternative solutions that use system sources of random data, such as Crypt::SysRandom, Crypt::URandom or Crypt::PRNG. References ---------- https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes 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.html
