Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Rrwo | Data\ | < 0.010, \ |
Related Weaknesses (CWE)
References
- https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvvVendor Advisory
- https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STRelease Notes
- https://metacpan.org/release/RRWO/Data-Entropy-0.010/changesRelease Notes
- https://security.metacpan.org/docs/guides/random-data-for-security.htmlThird Party Advisory
- http://www.openwall.com/lists/oss-security/2026/08/01/8Mailing ListThird Party Advisory
FAQ
What is CVE-2026-18536?
CVE-2026-18536 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ac...
How severe is CVE-2026-18536?
CVE-2026-18536 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-18536?
Check the references section above for vendor advisories and patch information. Affected products include: Rrwo Data\.