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Vulnerability record · CVE-2026-67215 · published 29 July 2026

CVE-2026-67215: Davegamble cjson vulnerability

DDavegamble · Cjson

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.

8.7 CVSS 4.0 High EPSS 0.70% · top 48.8% CWE-674 · CWE-674
8.7CVSS 4.0 base score
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References, 2 tagged exploit
4 Aug 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
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 ExploitPress/Media CoverageThird 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 ExploitPress/Media CoverageThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2025-57052Davegamble cjson out-of-bounds read vulnerabilitycJSON 1.5.0 through 1.7.18 allows out-of-bounds access via the decode_array_index_from_pointer function in cJSON_Utils.c, allowing remote attackers t…EPSS 0.74%9.8CVE-2019-11834Davegamble cjson out-of-bounds read vulnerabilitycJSON before 1.7.11 allows out-of-bounds access, related to \x00 in a string literal.EPSS 2.5%9.8CVE-2019-11835Davegamble cjson out-of-bounds read vulnerabilitycJSON before 1.7.11 allows out-of-bounds access, related to multiline comments.EPSS 2.6%9.8CVE-2016-10749Davegamble cjson out-of-bounds read vulnerabilityparse_string in cJSON.c in cJSON before 2016-10-02 has a buffer over-read, as demonstrated by a string that begins with a " character and ends with a…EPSS 2.5%9.8CVE-2018-1000217Davegamble cjson use after free vulnerabilityDave Gamble cJSON version 1.7.3 and earlier contains a CWE-416: Use After Free vulnerability in cJSON library that can result in Possible crash, corr…EPSS 1.8%8.8CVE-2018-1000216Davegamble cjson double free vulnerabilityDave Gamble cJSON version 1.7.2 and earlier contains a CWE-415: Double Free vulnerability in cJSON library that can result in Possible crash or RCE. …EPSS 1.5%8.2CVE-2026-67216Davegamble cjson vulnerabilitycJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each …EPSS 0.65%7.5CVE-2023-50471Davegamble cjson null pointer dereference vulnerabilitycJSON v1.7.16 was discovered to contain a segmentation violation via the function cJSON_InsertItemInArray at cJSON.c.EPSS 1.5%

Source: NIST National Vulnerability Database (record CVE-2026-67215), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.