Vulnerability in Rrwo Data\
CVE-2026-18536
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (10.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Rrwo Data\ — versions \
- Rrwo Data::entropy — versions 0
- Rrwo Data\:\:entropy
Weakness classification (CWE)
References
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (vendor-advisory, Vendor Advisory)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (release-notes, Release Notes)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Release Notes)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (technical-description, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-18536?
- CVE-2026-18536 is a high-severity vulnerability in Rrwo Data\, classified under Cleartext Transmission of Sensitive Information. CVSS score: 7.5/10. Published 2026-08-01.
- How severe is CVE-2026-18536?
- High severity. CVSS v3 base score is 7.5 out of 10.