Uncontrolled Recursion Affecting cjson package, versions *


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.46% (39th percentile)

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  • Snyk IDSNYK-UBUNTU2404-CJSON-18430133
  • published29 Aug 2026
  • disclosed29 Jul 2026

Introduced: 29 Jul 2026

CVE-2026-67215  (opens in a new tab)
CWE-674  (opens in a new tab)

How to fix?

There is no fixed version for Ubuntu:24.04 cjson.

NVD Description

Note: Versions mentioned in the description apply only to the upstream cjson package and not the cjson package as distributed by Ubuntu. See How to fix? for Ubuntu:24.04 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1