🛡️ CVE-2026-67215 — cjson

🟠 CVSS 7.5 — High ⚠️ Exploit Public CWE-674 NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, 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.

Affected software

CVE-2026-67215 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
github.com
joshua.hu
www.vulncheck.com
joshua.hu

Details

Severity HIGH
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE CWE-674
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-2026-67215 carries CVSS 7.5 High 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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