CVEvulnerability
CVE-2026-67216
8.2 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-29
- Last modified
- 2026-10-23
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 8.2 HIGH — CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-407
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.
Affected configurations
• davegamble cjson (<= 1.7.19)
Related
Weakness · CWE (1)
- CWE-407 Inefficient Algorithmic Complexity weakness
References
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L3057-L3180 Patch
- https://joshua.hu/cjson-json-parser-cve-vulnerabilities Exploit, Press/Media Coverage, Third Party Advisory
- https://www.vulncheck.com/advisories/cjson-cjson-compare-exponential-complexity-denial-of-service Third Party Advisory