cjson — security advisory
cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cJSON.c on 32-bit platforms. The escape_characters counter, a 32-bit size_t, 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 cJSON_PrintBuffered() 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.
- Products
- cjson
- Affected versions
- 1.7.10-1.1, 1.7.10-1.1ubuntu0.1~esm1, 1.7.14-1, 1.7.15-1, 1.7.15-1ubuntu0.1, 1.7.15-1ubuntu0.1+esm1, 1.7.15-1ubuntu0.1~esm2, 1.7.16-1, 1.7.16-2, 1.7.17-1, 1.7.17-1ubuntu0.1~esm2, 1.7.17-1ubuntu0.1~esm3, 1.7.18-3.1, 1.7.18-4, 1.7.19-1, 1.7.19-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-16554
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:04 UTC · Revision 1
Source evidence
cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cJSON.c on 32-bit platforms. The escape_characters counter, a 32-bit size_t, 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 cJSON_PrintBuffered() 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.
osv:UBUNTU-CVE-2026-16554
cjson
Fixed versions: Not specified
cjson
Fixed versions: Not specified
cjson
Fixed versions: Not specified
cjson
Fixed versions: Not specified
cjson
Fixed versions: Not specified
Complete source record
{
"id": "ac1055f7d2938727b7ee6cddc8cead3f0f3eee2b8f52111289406403e04990ca",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-16554",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-16554",
"summary": "cJSON library is vulnerable to an integer overflow in the print_string_ptr() function in cJSON.c on 32-bit platforms. The escape_characters counter, a 32-bit size_t, 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 cJSON_PrintBuffered() 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.",
"evidence": "osv:UBUNTU-CVE-2026-16554",
"products": [
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{
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-16554",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:L/SI:L/SA:L"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"events": [
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"package": {
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],
"modified": "2026-10-17T12:58:06.364842229Z",
"provider": "osv",
"upstream": [
"CVE-2026-16554"
],
"references": [
"https://ubuntu.com/security/CVE-2026-16554",
"https://www.cve.org/CVERecord?id=CVE-2026-16554",
"https://cert.pl/en/posts/2026/07/CVE-2026-16554",
"https://github.com/DaveGamble/cJSON"
]
},
"related_cves": [
{
"value": "CVE-2026-16554",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 358093,
"published_at": "2026-07-27T09:16:00+00:00"
}