SEPTEMBER 19, 2026
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Case File

CVE-2026-67217

MEDIUM · CVSS 5.3 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-29 · Last synced 2026-08-28

CyberRota Analysis

AI-Generated

The cJSON library, up to version 1.7.19, is vulnerable due to improper handling of JSON Patch operations, allowing an attacker to manipulate the target document even when the patch is reported as failed. This non-atomic application can lead to unintended data loss, as addressable members may be deleted during the process. Developers and organizations utilizing cJSON for JSON processing should prioritize this vulnerability to prevent potential data integrity issues.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-67217
Severity
MEDIUM
CVSS
5.3
EPSS
0.30%

Original NVD Description

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.

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