CVE-2026-13759

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 77% 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: 0%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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
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 13× in last 7d / 69× 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. 2026-07-27 02:01 UTCEG score recompute
  2. 2026-07-27 02:01 UTCGHSA enrichment
  3. 2026-07-26 14:54 UTCEPSS rescore
  4. 2026-07-26 14:54 UTCEPSS rescore
  5. 2026-07-26 13:50 UTCEG score recompute
  6. 2026-07-26 13:50 UTCGHSA enrichment
  7. 2026-07-25 14:17 UTCEPSS rescore
  8. 2026-07-24 14:17 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 03:05 UTCEG score recompute▲ 1.30
  11. 2026-07-22 14:08 UTCEPSS rescore
  12. 2026-07-21 15:24 UTCEPSS rescore
  13. 2026-07-20 17:08 UTCEPSS rescore
  14. 2026-07-19 14:30 UTCEPSS rescore
  15. 2026-07-19 02:28 UTCEPSS rescore
  16. 2026-07-18 10:04 UTCEPSS rescore
  17. 2026-07-17 03:19 UTCGHSA enrichment
  18. 2026-07-16 17:02 UTCEPSS rescore
  19. 2026-07-16 15:08 UTCGHSA enrichment
  20. 2026-07-16 02:56 UTCGHSA enrichment
  21. 2026-07-15 16:57 UTCEPSS rescore
  22. 2026-07-15 14:45 UTCGHSA enrichment
  23. 2026-07-15 02:33 UTCGHSA enrichment
  24. 2026-07-15 02:00 UTCEPSS rescore
  25. 2026-07-14 14:20 UTCGHSA enrichment
Show 44 more
  1. 2026-07-14 02:08 UTCGHSA enrichment
  2. 2026-07-13 22:30 UTCEPSS rescore
  3. 2026-07-13 13:57 UTCGHSA enrichment
  4. 2026-07-13 06:12 UTCEPSS rescore
  5. 2026-07-13 01:45 UTCGHSA enrichment
  6. 2026-07-12 13:34 UTCGHSA enrichment
  7. 2026-07-12 05:46 UTCEPSS rescore
  8. 2026-07-12 01:21 UTCGHSA enrichment
  9. 2026-07-11 13:11 UTCGHSA enrichment
  10. 2026-07-11 08:27 UTCEPSS rescore
  11. 2026-07-11 00:59 UTCGHSA enrichment
  12. 2026-07-10 12:47 UTCGHSA enrichment
  13. 2026-07-10 00:34 UTCGHSA enrichment
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-09 12:20 UTCGHSA enrichment
  16. 2026-07-09 00:09 UTCGHSA enrichment
  17. 2026-07-08 15:15 UTCEPSS rescore
  18. 2026-07-08 15:15 UTCEPSS rescore
  19. 2026-07-08 11:54 UTCGHSA enrichment
  20. 2026-07-07 23:33 UTCGHSA enrichment
  21. 2026-07-07 13:46 UTCEPSS rescore
  22. 2026-07-07 11:23 UTCGHSA enrichment
  23. 2026-07-06 23:12 UTCGHSA enrichment
  24. 2026-07-06 16:27 UTCEPSS rescore
  25. 2026-07-06 11:00 UTCGHSA enrichment
  26. 2026-07-06 02:23 UTCEPSS rescore
  27. 2026-07-05 22:27 UTCGHSA enrichment
  28. 2026-07-05 10:16 UTCGHSA enrichment
  29. 2026-07-05 02:30 UTCEPSS rescore
  30. 2026-07-05 02:30 UTCEPSS rescore
  31. 2026-07-04 22:05 UTCGHSA enrichment
  32. 2026-07-04 09:54 UTCGHSA enrichment
  33. 2026-07-04 06:31 UTCEPSS rescore
  34. 2026-07-03 21:43 UTCGHSA enrichment
  35. 2026-07-03 09:32 UTCGHSA enrichment
  36. 2026-07-02 21:20 UTCGHSA enrichment
  37. 2026-07-02 20:05 UTCNVD updateCVSS v3 → 8.8
  38. 2026-07-02 09:08 UTCGHSA enrichment
  39. 2026-07-01 20:56 UTCGHSA enrichment
  40. 2026-07-01 15:06 UTCEPSS rescore
  41. 2026-07-01 15:06 UTCEPSS rescore
  42. 2026-07-01 08:45 UTCGHSA enrichment
  43. 2026-06-30 20:34 UTCEG score recompute
  44. 2026-06-30 20:33 UTCNVD updatefirst tracked

Related CVEs(same CWE)

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 0% probability of exploitation in the next 30 days, which ranks it in the top 77.4% 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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