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 16, 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 49× in last 7d / 214× 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 391 total refreshes for this CVE.

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

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 84.6% 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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