CVE-2026-67215: cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion
CVE-2026-67215 is a vulnerability in cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion, rated Important by Microsoft, with a CVSS 3.1 base score of 7.5 (High). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.70% probability of exploitation activity in the next 30 days, higher than 54% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 2 products in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-67215
- Severity
- High CVSS 7.5
- Microsoft severity
- Important
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-674
- EPSS
- 0.70% (percentile 54%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-67215 at 7.5 (temporal 7.5) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | High |
Affected products (2)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 libglvnd 1.7.0-3 on Azure Linux 3.0 | Release Notes | Security Update | ||
| azl3 apparmor 3.1.7-1 on Azure Linux 3.0 | Release Notes | Security Update |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 7.5 (HIGH)
- NVD weakness
- CWE-674
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| cjson | up to and including 1.7.19 |
References
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON.c#L253-L261 (Patch)
- https://github.com/DaveGamble/cJSON/blob/v1.7.19/cJSON_Utils.c#L906-L940 (Patch)
- https://joshua.hu/cjson-json-parser-cve-vulnerabilities (Exploit, Press/Media Coverage, Third Party Advisory)
- https://www.vulncheck.com/advisories/cjson-json-patch-copy-add-uncontrolled-recursion-stack-exhaustion (Third Party Advisory)
- https://joshua.hu/cjson-json-parser-cve-vulnerabilities (Exploit, Press/Media Coverage, Third Party Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Information published. | |
| 2.0 | Information published. | |
| 3.0 | Information published. | |
| 4.0 | Information published. | |
| 5.0 | Information published. | |
| 6.0 | Information published. |