cJSON 1.5.0 through 1.7.18 allows out-of-bounds access via the decodearrayindexfrompointer function in cJSONUtils.c, allowing remote attackers to bypass array bounds checking and access restricted data via malformed JSON pointer strings containing alphanumeric characters.

Dave Gamble cJSON version 1.7.3 and earlier contains a CWE-416: Use After Free vulnerability

cJSON before 1.7.11 allows out-of-bounds access, related to multiline comments.

cJSON before 1.7.11 allows out-of-bounds access, related to \x00 in a string literal.

parsestring 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 \ character.

Dave 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. This attack appear to be exploitable via Attacker must be able to force victim to print JSON data, depending on how cJSON library is used this could be either local or over a network. This vulnerability appears to have been fixed in 1.7.3.

cJSON JSON Patch copy/add Uncontrolled Recursion Stack Exhaustion

cJSON cJSONCompare Exponential Complexity Denial of Service

Dave Gamble cJSON version 1.7.6 and earlier contains a CWE-772 vulnerability in cJSON library that can result in Denial of Service

DaveGamble/cJSON cJSON 1.7.8 is affected by: Improper Check for Unusual or Exceptional Conditions. The impact is: Null dereference, so attack can cause denial of service. The component is: cJSONGetObjectItemCaseSensitive() function. The attack vector is: crafted json file. The fixed version is: 1.7.9 and later.

cJSON v1.7.16 was discovered to contain a segmentation violation via the function cJSONSetValuestring at cJSON.c.

cJSON v1.7.16 was discovered to contain a segmentation violation via the function cJSONInsertItemInArray at cJSON.c.

cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in applypatch() in cJSONUtils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtilsApplyPatches() or cJSONUtilsApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.

cJSON library is vulnerable to an integer overflow in the printstringptr() function in cJSON.c on 32-bit platforms. The escapecharacters counter, a 32-bit sizet, can wrap around when processing strings containing approximately 858,993,460 or more control characters, causing the output buffer to be allocated based on an underestimated length. When cJSONPrintBuffered() is used with a pre-allocated buffer, the subsequent write loop overflows the heap allocation. An attacker supplying a crafted JSON string to an application using cJSON on a 32-bit platform can cause a heap buffer overflow, potentially leading to remote code execution, information disclosure, or denial of service.

Because project creator contact attempts were unsuccessful, the vulnerability has only been confirmed in version 1.7.19 but may also affect other versions.