CVE catalog
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 ac
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.20% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libdata-entropy-perl | sid | 0.008-1 | vulnerable |
| Debian | libdata-entropy-perl | forky | 0.008-1 | vulnerable |
| Debian | libdata-entropy-perl | trixie | 0.008-1 | vulnerable |
| Debian | libdata-entropy-perl | bookworm | 0.007-4+deb12u1 | vulnerable |
| Cpe | data\ | Not reported | 0.010 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libdata-entropy-perl | source | sid | (unfixed) | not yet assigned | Not reported | [1143264] |
| Debian | libdata-entropy-perl | source | forky | (unfixed) | not yet assigned | Not reported | [1143264] |
| Debian | libdata-entropy-perl | source | trixie | (unfixed) | not yet assigned | Not reported | [1143264] |
| Debian | libdata-entropy-perl | source | bookworm | (unfixed) | not yet assigned | Not reported | [1143264] |
| Cpe | data\ | cpe | Not reported | 0.010 | Not reported | NVD-CVE-2026-18536 | Not reported |
Notes
[trixie] libdata-entropy-perl: Minor issue; module is deprecated in favour of better options [bookworm] libdata-entropy-perl: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libdata-entropy-perl]Affected
Details (2)
0.007-4+deb12u1· all · bookwormAffected
nvd · libdata-entropy-perl · debian · bookworm; nvd · libdata-entropy-perl · debian · 12
0.007-4+deb12u1· all · bookwormAffected
nvd · libdata-entropy-perl · debian · bookworm; nvd · libdata-entropy-perl · debian · 12
[Debian 13 (Trixie)]
- [libdata-entropy-perl]Affected
Details (2)
0.008-1· all · trixieAffected
nvd · libdata-entropy-perl · debian · 13
0.008-1· all · trixieAffected
nvd · libdata-entropy-perl · debian · 13
Observed:
References
- [http://www.openwall.com/lists/oss-security/2026/08/01/8]
- [https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv]
- [https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS]
- [https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-18536]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-18536]
- [https://security-tracker.debian.org/tracker/CVE-2026-18536]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18536.json]
- [https://security.metacpan.org/docs/guides/random-data-for-security.html]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]