CVE-2026-13759

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

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

IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including RemoteConstructor.readResolve and PriorityQueue/ExtractorComparator are confirmed working, allowing a post-login attacker who can write a session attribute or a LAN-adjacent attacker on the grid replication wire to execute arbitrary code on peer WAS JVMs

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 3, 2026

Advisory Details (1)

Auto-updated Jun 30, 2026
No patch confirmed yet.
generic

Security Bulletin: IBM WebSphere eXtreme Scale is affected by Insecure Deserilization

https://www.ibm.com/support/pages/node/7278595

Vendor Advisories for CVE-2026-13759(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 105× 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 178 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-13759?
CVE-2026-13759 is a high vulnerability published on June 30, 2026. IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.1.6 ships three ObjectInputStream subclasses (WsObjectInputStream, ObjectStreamPool$ReusableInputStream, ObjectInputStreamResolver) that install no JEP-290 class filter; when Coherence is on the classpath, multiple RCE gadget chains including…
When was CVE-2026-13759 disclosed?
CVE-2026-13759 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13759 actively exploited?
CVE-2026-13759 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.5% of all scored CVEs.
What is the CVSS score of CVE-2026-13759?
CVE-2026-13759 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-13759?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13759, 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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