CVE-2026-67216 – cJSON cJSON_Compare Exponential Complexity Denial of Service

CVE ID :CVE-2026-67216

Published : July 29, 2026, 2:16 p.m. | 24 minutes ago

Description :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.

Severity: 8.2 | HIGH

Visit the link for more details, such as CVSS details, affected products, timeline, and more…