CVE-2026-67217

Summary

cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in apply_patch() in cJSON_Utils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.

Affected Software

Weaknesses

• CWE-696: Incorrect Behavior Order

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://joshua.hu/cjson-json-parser-cve-vulnerabilities

References

• https://joshua.hu/cjson-json-parser-cve-vulnerabilities
• https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L887-L948
• https://www.vulncheck.com/advisories/cjson-json-patch-non-atomic-application-destroys-data-before-validation

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