CVE Catalog

CVE-2026-18536

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.16%

6th percentile - higher than 6% of all known CVEs

Summary

The Data::Entropy module for Perl versions before 0.010 fetches remote entropy sources over plain HTTP. The Data::Entropy::RawSource::RandomOrg and Data::Entropy::RawSource::RandomnumbersInfo sources are accessed over HTTP, and the Data::Entropy::RawSource::RandomOrg integrity check matches any non-empty byte string.

Risk Assessment

Any on-path attacker (e.g., open WiFi, compromised ISP, captive portal) can substitute the response, controlling the bytes returned by rand_bits and rand_int. This can lead to predictability of random numbers, compromising cryptographic security of applications.

Recommendation

Update the Data::Entropy module to version 0.010 or later, which uses HTTPS. Also avoid using unsecured entropy sources in applications requiring cryptographic security.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS