CVE WatchJul 29, 2026

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 vi

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 29, 2026 · Last modified: Jul 29, 2026 · CWE-674

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-671946.5 MED

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