Vulnerability in Davegamble Cjson
CVE-2026-67215
cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.
EPSS: 0.005 (38.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Davegamble Cjson — versions 0
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, Third Party Advisory, exploit, Press/Media Coverage, third-party-advisory)
- disclosure@vulncheck.com (technical-description, Patch)
- disclosure@vulncheck.com (technical-description, Patch)
- disclosure@vulncheck.com (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-67215?
- CVE-2026-67215 is a high-severity vulnerability in Davegamble Cjson, classified under Uncontrolled Recursion. CVSS score: 7.5/10. Published 2026-07-29.
- How severe is CVE-2026-67215?
- High severity. CVSS v3 base score is 7.5 out of 10.