CVE-2026-86318
CVE-2026-86318
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.008 (54.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.008 · change: +0.003
Weakness classification (CWE)
References
- vuldb.com/vuln/399509 (technical-description, vdb-entry)
- vuldb.com/vuln/399509/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-86318 (third-party-advisory)
- vuldb.com/submit/908319 (third-party-advisory)
- github.com/java-json-tools/json-patch/issues/168 (issue-tracking, exploit, patch)
- github.com/java-json-tools/json-patch/ (product, patch)
Frequently asked questions
- What is CVE-2026-86318?
- CVE-2026-86318 is a medium-severity vulnerability, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-09-07.
- How severe is CVE-2026-86318?
- Medium severity. CVSS v3 base score is 5.3 out of 10.