🛡️ CVE-2026-67216 — cjson

🟡 CVSS 5.9 — Medium ⚠️ Exploit Public CWE-407 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-67216 is classified as CWE-407: Inefficient Algorithmic Complexity. Crafted input drives an algorithm into its worst case, so a small request costs disproportionate work.

Affected software

CVE-2026-67216 is recorded against 1 package.

  • cjson (fixed in 1.7.19)

Timeline and source

Published on 29 July 2026 and last revised on 4 August 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com
joshua.hu
www.vulncheck.com

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-407
Public Exploit ⚠️ Yes
Source NVD
Published 2026-07-29
Updated 2026-08-11
Modified 2026-08-04

Affected Packages

Software From version Fixed in
cjson — 1.7.19

Similar Threats

Exploit Protection

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CVE-2026-67216 carries CVSS 5.9 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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