High
cjson — security advisory
cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.
- 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-2026-29036
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:58 UTC · Revision 1
Source evidence
cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.
osv:UBUNTU-CVE-2026-29036
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": "b0e133c2f1fed0d1ca42ca0a5690a92f578e0b4a77aa744d7869dfef2ba9285e",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-29036",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-29036",
"summary": "cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.",
"evidence": "osv:UBUNTU-CVE-2026-29036",
"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-2026-29036",
"aliases": [
"UBUNTU-CVE-2026-29036"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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-2026-29036.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-2026-29036.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-2026-29036.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-2026-29036.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-2026-29036.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libcjson1",
"binary_version": "1.7.19-2"
}
]
}
}
],
"modified": "2026-10-17T12:59:57.106720472Z",
"provider": "osv",
"upstream": [
"CVE-2026-29036"
],
"references": [
"https://ubuntu.com/security/CVE-2026-29036",
"https://www.cve.org/CVERecord?id=CVE-2026-29036",
"https://github.com/DaveGamble/cJSON",
"https://www.vulncheck.com/advisories/cjson-wrong-key-modification-via-json-pointer-escape-decoding"
]
},
"related_cves": [
{
"value": "CVE-2026-29036",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 360027,
"published_at": "2026-08-11T22:17:00+00:00"
}