High
cjson — security advisory
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.
- 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-2026-67215
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:10 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-67215
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": "55d71cef9ddc245e804a666aeed3d87aa9f312cfca134a54cf138432c9739fc6",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-67215",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-67215",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-67215",
"products": [
{
"name": {
"value": "cjson",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.10-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "1.7.10-1.1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.14-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.15-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.15-1ubuntu0.1~esm2",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.15-1ubuntu0.1",
"evidence": "/affected/1/versions"
},
{
"value": "1.7.15-1ubuntu0.1+esm1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.16-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.16-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.17-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.17-1ubuntu0.1~esm2",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.17-1ubuntu0.1~esm3",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.19-2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.18-3.1",
"evidence": "/affected/4/versions"
},
{
"value": "1.7.18-4",
"evidence": "/affected/4/versions"
},
{
"value": "1.7.19-1",
"evidence": "/affected/4/versions"
},
{
"value": "1.7.19-2",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-67215",
"aliases": [
"UBUNTU-CVE-2026-67215"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "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"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cjson",
"purl": "pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"1.7.10-1.1",
"1.7.10-1.1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.10-1.1ubuntu0.1~esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cjson",
"purl": "pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"1.7.14-1",
"1.7.15-1",
"1.7.15-1ubuntu0.1~esm2",
"1.7.15-1ubuntu0.1",
"1.7.15-1ubuntu0.1+esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.15-1ubuntu0.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cjson",
"purl": "pkg:deb/ubuntu/cjson?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1.7.16-1",
"1.7.16-2",
"1.7.17-1",
"1.7.17-1ubuntu0.1~esm2",
"1.7.17-1ubuntu0.1~esm3"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.17-1ubuntu0.1~esm3"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cjson",
"purl": "pkg:deb/ubuntu/cjson?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.7.19-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.19-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "cjson",
"purl": "pkg:deb/ubuntu/cjson?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1.7.18-3.1",
"1.7.18-4",
"1.7.19-1",
"1.7.19-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67215.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.19-2"
}
]
}
}
],
"modified": "2026-10-17T12:56:41.405742179Z",
"provider": "osv",
"upstream": [
"CVE-2026-67215"
],
"references": [
"https://ubuntu.com/security/CVE-2026-67215",
"https://www.cve.org/CVERecord?id=CVE-2026-67215",
"https://joshua.hu/cjson-json-parser-cve-vulnerabilities"
]
},
"related_cves": [
{
"value": "CVE-2026-67215",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 355959,
"published_at": "2026-07-29T14:16:00+00:00"
}