CVE-2026-18536

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under CISA-ADP (Vulnrichment) CVSS v3.1 (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cisa-adp, epss
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

August 1, 2026

Last Modified

August 7, 2026

Advisory Details (5)

Auto-updated Aug 3, 2026
Patch available. Sources: github.
generic

oss-security - CVE-2026-18536: Data::Entropy versions before 0.010 for Perl read remote entropy sources over plain HTTP

http://www.openwall.com/lists/oss-security/2026/08/01/8
generic

CPAN Author’s Guide to Random Data for Security — CPAN Security Group (CPANSec) 🦆

https://security.metacpan.org/docs/guides/random-data-for-security.html
generic

Changes - metacpan.org

https://metacpan.org/release/RRWO/Data-Entropy-0.010/changes
generic

Data::Entropy - entropy (randomness) management - metacpan.org

https://metacpan.org/release/RRWO/Data-Entropy-0.008/view/lib/Data/Entropy.pm#STATUS
github Patch Available

Data::Entropy::RawSource::RandomOrg requests data from random.org over unsecured http · Advisory · robrwo/Data-Entropy · GitHub

https://github.com/robrwo/Data-Entropy/security/advisories/GHSA-845w-rcqw-jwvv

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libdata-entropy-perl0.007-3.1, 0.007-3.1+deb11u1, 0.007-4, 0.008-1——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libdata-entropy-perl0.007-4, 0.007-4+deb12u1, 0.008-1——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libdata-entropy-perl0.008-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libdata-entropy-perl0.008-1——

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-25 00:31 UTCEG score recompute
  3. 2026-08-24 12:03 UTCEG score recompute
  4. 2026-08-23 10:48 UTCEG score recompute
  5. 2026-08-23 00:19 UTCEPSS rescore
  6. 2026-08-22 09:51 UTCEG score recompute
  7. 2026-08-21 23:49 UTCEPSS rescore
  8. 2026-08-21 08:53 UTCEG score recompute
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-19 19:25 UTCEG score recompute
  11. 2026-08-19 17:03 UTCEPSS rescore
  12. 2026-08-18 18:22 UTCEG score recompute
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 16:07 UTCEG score recompute
  15. 2026-08-17 13:47 UTCEPSS rescore
  16. 2026-08-16 15:10 UTCEG score recompute
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 02:42 UTCEG score recompute
  19. 2026-08-16 02:14 UTCEPSS rescore
  20. 2026-08-15 01:45 UTCEG score recompute
  21. 2026-08-15 01:30 UTCEPSS rescore
  22. 2026-08-14 00:48 UTCEG score recompute
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-12 23:51 UTCEG score recompute
  25. 2026-08-12 13:50 UTCEPSS rescore
Show 23 more
  1. 2026-08-11 10:26 UTCEG score recompute
  2. 2026-08-11 00:00 UTCEPSS rescore
  3. 2026-08-09 21:01 UTCEG score recompute
  4. 2026-08-09 13:46 UTCEPSS rescore
  5. 2026-08-08 20:05 UTCEG score recompute
  6. 2026-08-08 16:37 UTCEPSS rescore
  7. 2026-08-07 19:08 UTCEG score recompute
  8. 2026-08-06 23:13 UTCEG score recompute
  9. 2026-08-06 13:46 UTCEPSS rescore
  10. 2026-08-05 22:16 UTCEG score recompute
  11. 2026-08-05 19:17 UTCEPSS rescore
  12. 2026-08-04 21:18 UTCEG score recompute
  13. 2026-08-04 15:10 UTCEPSS rescore
  14. 2026-08-04 10:38 UTCEPSS rescore
  15. 2026-08-03 20:13 UTCEG score recompute▲ 7.50
  16. 2026-08-03 20:13 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  17. 2026-08-03 16:56 UTCEG score recompute
  18. 2026-08-03 10:35 UTCEPSS rescore
  19. 2026-08-01 16:25 UTCNVD update
  20. 2026-08-01 15:37 UTCMITRE cvelistV5
  21. 2026-08-01 11:29 UTCNVD update
  22. 2026-08-01 11:03 UTCEG score recompute
  23. 2026-08-01 11:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18536?
CVE-2026-18536 is a high vulnerability published on August 1, 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…
When was CVE-2026-18536 disclosed?
CVE-2026-18536 was first published in the National Vulnerability Database on August 1, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18536 actively exploited?
CVE-2026-18536 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 94.5% of all scored CVEs.
What is the CVSS score of CVE-2026-18536?
CVE-2026-18536 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-18536?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18536, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18536

Explore →

Is Your Infrastructure Affected by CVE-2026-18536?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs