CVE-2026-16439

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory published 2026-07-21. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

July 21, 2026

Last Modified

August 11, 2026

Advisory Details (2)

Auto-updated Sep 7, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
generic

Eclipse Projects Security / cve-assignment · GitLab

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/192
github_pr

(0.60) Fix bug causing null to be written before the allocated buffer start

Fix merged in eclipse-openj9/openj9 PR #24394 on 2026-07-21 — awaiting tagged release

https://github.com/eclipse-openj9/openj9/pull/24394

Vendor Advisories for CVE-2026-16439(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatjava-21-ibm-semeru-certified-jdk-1:21.0.12.0.8-1.el10_02026-08-10redhat
redhatjava-1.8.0-ibm-1:1.8.0.8.70-1.el8_102026-08-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 37× in last 7d / 259× 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 340 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-16439?
CVE-2026-16439 is a critical vulnerability published on July 21, 2026. In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.
When was CVE-2026-16439 disclosed?
CVE-2026-16439 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on August 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-16439 actively exploited?
CVE-2026-16439 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 85.0% of all scored CVEs.
What is the CVSS score of CVE-2026-16439?
CVE-2026-16439 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-16439?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-16439, 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.

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