CVE-2026-67216
Medium · 5.9CVSS
5.9
EPSS
0.6%
Published
Jul 29, 2026
CISA due date
—
The record
cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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