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: 0.5% (38th percentile of EPSS-scored CVEs). 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.7Exploit: None knownExposed services: Not assessed

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

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
8.7HIGHmedium confidence
EG Risk
54
EG Risk 54/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 12, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 12, 2026
No fix on record 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 16× in last 7d / 86× 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.

Showing the most recent 100 of 194 total refreshes for this CVE.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-08 17:11 UTCEPSS rescore
  3. 2026-10-07 23:47 UTCEPSS rescore
  4. 2026-10-07 05:32 UTCGHSA enrichment
  5. 2026-10-06 17:28 UTCEG score recompute
  6. 2026-10-06 17:28 UTCGHSA enrichment
  7. 2026-10-06 15:17 UTCEPSS rescore
  8. 2026-10-05 17:42 UTCEPSS rescore
  9. 2026-10-05 14:48 UTCEG score recompute
  10. 2026-10-05 14:48 UTCGHSA enrichment
  11. 2026-10-04 23:21 UTCEPSS rescore
  12. 2026-10-04 22:30 UTCGHSA enrichment
  13. 2026-10-04 08:14 UTCGHSA enrichment
  14. 2026-10-03 19:59 UTCEG score recompute
  15. 2026-10-03 19:59 UTCGHSA enrichment
  16. 2026-10-03 14:25 UTCEPSS rescore
  17. 2026-10-02 22:00 UTCEG score recompute
  18. 2026-10-02 22:00 UTCGHSA enrichment
  19. 2026-10-02 08:21 UTCEG score recompute
  20. 2026-10-02 08:21 UTCGHSA enrichment
  21. 2026-10-01 19:49 UTCEPSS rescore
  22. 2026-10-01 10:00 UTCGHSA enrichment
  23. 2026-09-30 21:56 UTCEG score recompute
  24. 2026-09-30 21:56 UTCGHSA enrichment
  25. 2026-09-30 15:02 UTCEPSS rescore
Show 75 more
  1. 2026-09-29 15:20 UTCEPSS rescore
  2. 2026-09-29 04:49 UTCEG score recompute
  3. 2026-09-29 04:49 UTCGHSA enrichment
  4. 2026-09-28 13:51 UTCEPSS rescore
  5. 2026-09-28 13:31 UTCGHSA enrichment
  6. 2026-09-28 01:27 UTCEG score recompute
  7. 2026-09-28 01:27 UTCGHSA enrichment
  8. 2026-09-27 13:47 UTCEPSS rescore
  9. 2026-09-27 09:55 UTCEG score recompute
  10. 2026-09-27 09:55 UTCGHSA enrichment
  11. 2026-09-26 15:58 UTCEPSS rescore
  12. 2026-09-25 03:42 UTCEG score recompute
  13. 2026-09-25 03:42 UTCGHSA enrichment
  14. 2026-09-24 09:17 UTCGHSA enrichment
  15. 2026-09-23 21:13 UTCEG score recompute
  16. 2026-09-23 21:13 UTCGHSA enrichment
  17. 2026-09-23 09:10 UTCGHSA enrichment
  18. 2026-09-22 21:06 UTCEG score recompute
  19. 2026-09-22 21:06 UTCGHSA enrichment
  20. 2026-09-22 08:16 UTCEG score recompute
  21. 2026-09-22 08:16 UTCGHSA enrichment
  22. 2026-09-21 20:10 UTCGHSA enrichment
  23. 2026-09-21 06:27 UTCEG score recompute
  24. 2026-09-21 06:27 UTCGHSA enrichment
  25. 2026-09-20 16:35 UTCGHSA enrichment
  26. 2026-09-20 02:53 UTCEG score recompute
  27. 2026-09-20 02:53 UTCGHSA enrichment
  28. 2026-09-19 14:38 UTCGHSA enrichment
  29. 2026-09-19 02:02 UTCEG score recompute
  30. 2026-09-19 02:02 UTCGHSA enrichment
  31. 2026-09-18 19:27 UTCEPSS rescore
  32. 2026-09-18 13:58 UTCGHSA enrichment
  33. 2026-09-18 01:49 UTCEG score recompute
  34. 2026-09-18 01:49 UTCGHSA enrichment
  35. 2026-09-17 13:45 UTCGHSA enrichment
  36. 2026-09-17 00:22 UTCEG score recompute
  37. 2026-09-17 00:22 UTCGHSA enrichment
  38. 2026-09-16 14:07 UTCEPSS rescore
  39. 2026-09-16 05:14 UTCEPSS rescore
  40. 2026-09-16 01:18 UTCGHSA enrichment
  41. 2026-09-15 13:12 UTCEG score recompute
  42. 2026-09-15 13:12 UTCGHSA enrichment
  43. 2026-09-14 21:58 UTCGHSA enrichment
  44. 2026-09-14 06:46 UTCGHSA enrichment
  45. 2026-09-13 18:43 UTCEG score recompute
  46. 2026-09-13 18:43 UTCGHSA enrichment
  47. 2026-09-13 16:46 UTCEPSS rescore
  48. 2026-09-13 06:39 UTCGHSA enrichment
  49. 2026-09-12 18:36 UTCEG score recompute
  50. 2026-09-12 18:36 UTCGHSA enrichment
  51. 2026-09-12 15:00 UTCEPSS rescore
  52. 2026-09-12 06:32 UTCGHSA enrichment
  53. 2026-09-11 18:27 UTCEG score recompute
  54. 2026-09-11 18:27 UTCGHSA enrichment
  55. 2026-09-11 14:52 UTCEPSS rescore
  56. 2026-09-11 09:36 UTCEPSS rescore
  57. 2026-09-11 06:23 UTCGHSA enrichment
  58. 2026-09-10 18:20 UTCEG score recompute
  59. 2026-09-10 18:20 UTCGHSA enrichment
  60. 2026-09-10 09:34 UTCEPSS rescore
  61. 2026-09-10 06:16 UTCGHSA enrichment
  62. 2026-09-09 17:53 UTCGHSA enrichment
  63. 2026-09-09 05:16 UTCEG score recompute
  64. 2026-09-09 05:16 UTCGHSA enrichment
  65. 2026-09-08 22:00 UTCEPSS rescore
  66. 2026-09-08 04:47 UTCGHSA enrichment
  67. 2026-09-07 16:43 UTCEG score recompute
  68. 2026-09-07 16:43 UTCGHSA enrichment
  69. 2026-09-07 16:01 UTCEPSS rescore
  70. 2026-09-07 01:31 UTCEG score recompute
  71. 2026-09-07 01:31 UTCGHSA enrichment
  72. 2026-09-06 13:47 UTCEPSS rescore
  73. 2026-09-06 13:27 UTCGHSA enrichment
  74. 2026-09-06 01:23 UTCEG score recompute
  75. 2026-09-06 01:23 UTCGHSA enrichment

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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 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 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-15803?
CVE-2026-15803 has a CVSS base score of 8.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-15803?
No fix for CVE-2026-15803 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-15803 are linked in the Vendor Advisories panel on this page.

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