CVE-2026-86318

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-07. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A flaw has been found in java-json-tools json-patch up to 1.13. Affected is the function JsonMergePatch.fromJson of the file JsonMergePatchDeserializer.java. Executing a manipulation can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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
Severity53% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

September 7, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Sep 7, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

GitHub - java-json-tools/json-patch: An RFC 6902 (JSON Patch) and reverse, plus RFC 7386 (JSON Merge Patch), implementation in Java using Jackson (2.2.x) · GitHub

https://github.com/java-json-tools/json-patch/
generic🟡 PoC Available

[Security] Stack Overflow DoS via Uncontrolled Recursion in JsonMergePatch Deserialization · Issue #168 · java-json-tools/json-patch · GitHub

https://github.com/java-json-tools/json-patch/issues/168

Vendor Advisories for CVE-2026-86318(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 20× in last 7d / 56× 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. 2026-09-25 04:49 UTCEG score recompute
  2. 2026-09-25 04:49 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 06:46 UTCEG score recompute
  5. 2026-09-24 06:46 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 08:44 UTCEG score recompute
  8. 2026-09-23 08:44 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 10:41 UTCEG score recompute
  11. 2026-09-22 10:41 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 12:31 UTCEG score recompute
  14. 2026-09-21 12:31 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 14:27 UTCGHSA enrichment
  17. 2026-09-19 16:25 UTCEG score recompute
  18. 2026-09-19 16:25 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-18 18:23 UTCGHSA enrichment
  21. 2026-09-17 20:20 UTCEG score recompute
  22. 2026-09-17 20:20 UTCGHSA enrichment
  23. 2026-09-17 19:32 UTCEPSS rescore
  24. 2026-09-16 21:28 UTCEG score recompute
  25. 2026-09-16 21:28 UTCGHSA enrichment
Show 31 more
  1. 2026-09-16 14:09 UTCEPSS rescore
  2. 2026-09-16 05:15 UTCEPSS rescore
  3. 2026-09-15 23:22 UTCEG score recompute
  4. 2026-09-15 23:22 UTCGHSA enrichment
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 03:12 UTCEPSS rescore
  7. 2026-09-15 01:12 UTCGHSA enrichment
  8. 2026-09-14 03:09 UTCEG score recompute
  9. 2026-09-14 03:09 UTCGHSA enrichment
  10. 2026-09-13 05:07 UTCEG score recompute
  11. 2026-09-13 05:07 UTCGHSA enrichment
  12. 2026-09-12 07:05 UTCEG score recompute
  13. 2026-09-12 07:05 UTCGHSA enrichment
  14. 2026-09-11 14:53 UTCEPSS rescore
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-11 09:02 UTCGHSA enrichment
  17. 2026-09-10 10:59 UTCEG score recompute
  18. 2026-09-10 10:59 UTCGHSA enrichment
  19. 2026-09-09 12:48 UTCEG score recompute
  20. 2026-09-09 12:48 UTCGHSA enrichment
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-08 14:45 UTCEG score recompute
  23. 2026-09-08 14:44 UTCGHSA enrichment
  24. 2026-09-08 13:45 UTCEG score recompute
  25. 2026-09-08 13:44 UTCGHSA enrichment
  26. 2026-09-08 13:25 UTCNVD updateCVSS v4 → 5.5
  27. 2026-09-08 13:24 UTCMITRE cvelistV5CVSS v4 → 6.9
  28. 2026-09-07 15:23 UTCEG score recompute
  29. 2026-09-07 15:22 UTCNVD updateCVSS v4 → 5.5
  30. 2026-09-07 14:38 UTCEG score recompute
  31. 2026-09-07 14:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86318?
CVE-2026-86318 is a medium vulnerability published on September 7, 2026. A flaw has been found in java-json-tools json-patch up to 1.13. Affected is the function JsonMergePatch.fromJson of the file JsonMergePatchDeserializer.java. Executing a manipulation can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been published and…
When was CVE-2026-86318 disclosed?
CVE-2026-86318 was first published in the National Vulnerability Database on September 7, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86318 actively exploited?
CVE-2026-86318 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 46.8% of all scored CVEs.
What is the CVSS score of CVE-2026-86318?
CVE-2026-86318 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-86318?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86318, 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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