CVE-2026-15803

HIGHPre-NVD 8.78.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 73% 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: epss, secondary
Trending — 3 sources updated this week
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.7Exploit: None knownExposed: 0

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

In Eclipse RDF4J, several XML parser entry points do not fully restrict XML External Entity (XXE) processing when parsing untrusted XML-based RDF data or query results, permitting DOCTYPE declarations, external entity references, and external DTD loading. This is due to an incomplete fix for CVE-2018-1000644: the earlier fix did not cover all parser entry points. The issue is resolved in RDF4J 5.3.2, which rejects or disables DOCTYPE declarations, external entities, and external DTD loading by default.

CVSS v3
8.7
EG Score
8.7(medium)
EG Risk
54(Track)
EG Risk 54/100SSVC: 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
Severity87% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
27%
KEV
Not listed

Published

August 12, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

request CVE for XXE in RDF4J before version 5.3.2 (#175) · Issues · Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/175
generic

5.3.2 · Eclipse RDF4J™ | The Eclipse Foundation

https://rdf4j.org/release-notes/5.3.2/

Vendor Advisories for CVE-2026-15803(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 38× 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. 2026-08-20 15:49 UTCGHSA enrichment
  2. 2026-08-20 03:46 UTCEG score recompute
  3. 2026-08-20 03:45 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 15:40 UTCGHSA enrichment
  6. 2026-08-19 03:37 UTCGHSA enrichment
  7. 2026-08-18 15:33 UTCEG score recompute
  8. 2026-08-18 15:33 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-18 04:07 UTCGHSA enrichment
  11. 2026-08-17 16:02 UTCEG score recompute
  12. 2026-08-17 16:02 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 03:59 UTCGHSA enrichment
  15. 2026-08-16 15:55 UTCEG score recompute
  16. 2026-08-16 15:55 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 03:52 UTCEG score recompute
  19. 2026-08-16 03:52 UTCGHSA enrichment
  20. 2026-08-16 02:14 UTCEPSS rescore
  21. 2026-08-15 15:49 UTCGHSA enrichment
  22. 2026-08-15 03:45 UTCEG score recompute
  23. 2026-08-15 03:45 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 15:41 UTCGHSA enrichment
Show 13 more
  1. 2026-08-14 03:37 UTCEG score recompute
  2. 2026-08-14 03:37 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 15:34 UTCEG score recompute
  5. 2026-08-13 15:34 UTCGHSA enrichment
  6. 2026-08-13 07:23 UTCGHSA enrichment
  7. 2026-08-12 19:19 UTCEG score recompute
  8. 2026-08-12 19:19 UTCGHSA enrichment
  9. 2026-08-12 18:56 UTCEG score recompute
  10. 2026-08-12 18:56 UTCGHSA enrichment
  11. 2026-08-12 16:33 UTCEG score recompute
  12. 2026-08-12 16:01 UTCEG score recompute
  13. 2026-08-12 16:00 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-15803?
CVE-2026-15803 is a high vulnerability published on August 12, 2026. In Eclipse RDF4J, several XML parser entry points do not fully restrict XML External Entity (XXE) processing when parsing untrusted XML-based RDF data or query results, permitting DOCTYPE declarations, external entity references, and external DTD loading. This is due to an incomplete fix for…
When was CVE-2026-15803 disclosed?
CVE-2026-15803 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-15803 actively exploited?
CVE-2026-15803 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 72.5% of all scored CVEs.
What is the CVSS score of CVE-2026-15803?
CVE-2026-15803 has a CVSS v3 base score of 8.7 (NVD).
How do I remediate CVE-2026-15803?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-15803, 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

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