CVE-2026-67215
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:davegamble:cjson:*:*:*:*:*:*:*:*range: <=1.7.19
- (no CPE)range: v1.7.19, v1.7.18, v1.7.17, …
- (no CPE)range: <=1.7.19
Patches
Vulnerability mechanics
References
4- github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.cnvdPatch
- github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.cnvdPatch
- joshua.hu/cjson-json-parser-cve-vulnerabilitiesnvdExploitPress/Media CoverageThird Party Advisory
- www.vulncheck.com/advisories/cjson-json-patch-copy-add-uncontrolled-recursion-stack-exhaustionnvdThird Party Advisory
News mentions
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