Buffer overflow in Davegamble Cjson
CVE-2026-87933
A vulnerability was found in DaveGamble cJSON up to 1.7.19. The affected element is the function cJSONUtils_MergePatch of the file cJSON_Utils.c. The manipulation results in use after free. The attack may be launched remotely. The exploit has been made public and could be used. The pull request to fix this issue awaits acceptance.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.005 (43.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 43.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Davegamble Cjson — versions 1.7.0, 1.7.1, 1.7.10
Weakness classification (CWE)
References
- vuldb.com/vuln/401815 (technical-description, vdb-entry)
- vuldb.com/vuln/401815/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-87933 (third-party-advisory)
- vuldb.com/submit/911136 (third-party-advisory)
- github.com/DaveGamble/cJSON/issues/1060 (issue-tracking, exploit)
- github.com/DaveGamble/cJSON/pull/1065 (issue-tracking, patch)
- github.com/DaveGamble/cJSON/ (product)
Frequently asked questions
- What is CVE-2026-87933?
- CVE-2026-87933 is a high-severity vulnerability in Davegamble Cjson, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.3/10. Published 2026-09-10.
- How severe is CVE-2026-87933?
- High severity. CVSS v3 base score is 7.3 out of 10.