High
cjson, iperf3 and 2 more products — security advisory
cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.
- Products
- cjson, iperf3, mapcache, sail-ocaml
- Affected versions
- 0.19.1+dfsg5-1, 0.19.1+dfsg5-1build2, 0.19.1+dfsg5-1build3, 0.20.2+dfsg-1build1, 1.10.0-1, 1.10.0-2build1, 1.10.0-2build3, 1.12.0-1, 1.14.0-2, 1.14.0-2build1, 1.14.0-2build2, 1.14.0-4build1, 1.14.0-4build2, 1.14.1-3, 1.14.1-3build1, 1.14.1-3build2, 1.16.0-1, 1.16.0-1build1, 1.4.0-3, 1.4.0-4, 1.6.0-2, 1.6.1-1, 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, 1.8.0-1, 1.8.0-1build2, 3.0.11-1, 3.0.11-1ubuntu0.1~esm1, 3.0.11-1ubuntu0.1~esm2, 3.1.3-1, 3.1.3-1ubuntu0.1~esm1, 3.14-1, 3.15-1, 3.16-1, 3.16-1build1, 3.16-1build2, 3.16-1ubuntu0.1~esm1, 3.18-2, 3.19.1-2, 3.20-2, 3.20-2.1, 3.20-2.1build1, 3.6-2, 3.7-1, 3.7-2, 3.7-3, 3.7-3ubuntu0.1~esm1, 3.7-3ubuntu0.1~esm2, 3.9-1, 3.9-1+deb11u1build0.22.04.1, 3.9-1+deb11u1ubuntu0.1, 3.9-1+deb11u1ubuntu0.1~esm1, 3.9-1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-67216
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:10 UTC · Revision 1
Source evidence
cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.
osv:UBUNTU-CVE-2026-67216
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
cjson
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
cjson
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
cjson
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
cjson
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
sail-ocaml
Fixed versions: Not specified
cjson
Fixed versions: Not specified
iperf3
Fixed versions: Not specified
mapcache
Fixed versions: Not specified
sail-ocaml
Fixed versions: Not specified
Complete source record
{
"id": "68376c2dc087d3e37cc9f21cf883b8e15e2ddd72523013846344110f90b043dc",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-67216",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-67216",
"summary": "cJSON through 1.7.19 contains an inefficient algorithmic complexity flaw in cJSON_Compare(). When comparing objects, the function recurses into each shared subtree twice, once in each direction, with no depth guard, making the running time exponential in nesting depth. A small, deeply nested document of a few hundred bytes (depth around 40) compared for equality consumes hours of CPU, and the cost roughly doubles with each additional level of nesting. An application that calls cJSON_Compare() on attacker-influenced JSON that is structurally equal to a reference document is exposed to a denial-of-service condition.",
"evidence": "osv:UBUNTU-CVE-2026-67216",
"products": [
{
"name": {
"value": "iperf3",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"value": "3.0.11-1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
},
{
"value": "3.0.11-1ubuntu0.1~esm2",
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}
]
},
{
"name": {
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{
"value": "1.4.0-3",
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{
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{
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{
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{
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}
]
},
{
"name": {
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"affected_versions": [
{
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},
{
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},
{
"name": {
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{
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{
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}
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{
"name": {
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},
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"affected_versions": [
{
"value": "3.6-2",
"evidence": "/affected/5/versions"
},
{
"value": "3.7-1",
"evidence": "/affected/5/versions"
},
{
"value": "3.7-2",
"evidence": "/affected/5/versions"
},
{
"value": "3.7-3",
"evidence": "/affected/5/versions"
},
{
"value": "3.7-3ubuntu0.1~esm1",
"evidence": "/affected/5/versions"
},
{
"value": "3.7-3ubuntu0.1~esm2",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "mapcache",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.8.0-1",
"evidence": "/affected/6/versions"
},
{
"value": "1.8.0-1build2",
"evidence": "/affected/6/versions"
},
{
"value": "1.10.0-1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "mapcache",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.10.0-2build1",
"evidence": "/affected/7/versions"
},
{
"value": "1.10.0-2build3",
"evidence": "/affected/7/versions"
},
{
"value": "1.12.0-1",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.14-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.7.15-1",
"evidence": "/affected/8/versions"
},
{
"value": "1.7.15-1ubuntu0.1~esm2",
"evidence": "/affected/8/versions"
},
{
"value": "1.7.15-1ubuntu0.1",
"evidence": "/affected/8/versions"
},
{
"value": "1.7.15-1ubuntu0.1+esm1",
"evidence": "/affected/8/versions"
}
]
},
{
"name": {
"value": "iperf3",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.9-1",
"evidence": "/affected/9/versions"
},
{
"value": "3.9-1build1",
"evidence": "/affected/9/versions"
},
{
"value": "3.9-1+deb11u1build0.22.04.1",
"evidence": "/affected/9/versions"
},
{
"value": "3.9-1+deb11u1ubuntu0.1~esm1",
"evidence": "/affected/9/versions"
},
{
"value": "3.9-1+deb11u1ubuntu0.1",
"evidence": "/affected/9/versions"
}
]
},
{
"name": {
"value": "mapcache",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.14.0-2",
"evidence": "/affected/10/versions"
},
{
"value": "1.14.0-2build1",
"evidence": "/affected/10/versions"
},
{
"value": "1.14.0-2build2",
"evidence": "/affected/10/versions"
},
{
"value": "1.14.0-4build1",
"evidence": "/affected/10/versions"
},
{
"value": "1.14.0-4build2",
"evidence": "/affected/10/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.16-1",
"evidence": "/affected/11/versions"
},
{
"value": "1.7.16-2",
"evidence": "/affected/11/versions"
},
{
"value": "1.7.17-1",
"evidence": "/affected/11/versions"
},
{
"value": "1.7.17-1ubuntu0.1~esm2",
"evidence": "/affected/11/versions"
},
{
"value": "1.7.17-1ubuntu0.1~esm3",
"evidence": "/affected/11/versions"
}
]
},
{
"name": {
"value": "iperf3",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.14-1",
"evidence": "/affected/12/versions"
},
{
"value": "3.15-1",
"evidence": "/affected/12/versions"
},
{
"value": "3.16-1",
"evidence": "/affected/12/versions"
},
{
"value": "3.16-1build1",
"evidence": "/affected/12/versions"
},
{
"value": "3.16-1build2",
"evidence": "/affected/12/versions"
},
{
"value": "3.16-1ubuntu0.1~esm1",
"evidence": "/affected/12/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.19-2",
"evidence": "/affected/13/versions"
}
]
},
{
"name": {
"value": "iperf3",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.20-2",
"evidence": "/affected/14/versions"
},
{
"value": "3.20-2.1",
"evidence": "/affected/14/versions"
},
{
"value": "3.20-2.1build1",
"evidence": "/affected/14/versions"
}
]
},
{
"name": {
"value": "mapcache",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.14.1-3build2",
"evidence": "/affected/15/versions"
},
{
"value": "1.16.0-1",
"evidence": "/affected/15/versions"
},
{
"value": "1.16.0-1build1",
"evidence": "/affected/15/versions"
}
]
},
{
"name": {
"value": "sail-ocaml",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.19.1+dfsg5-1build3",
"evidence": "/affected/16/versions"
},
{
"value": "0.20.2+dfsg-1build1",
"evidence": "/affected/16/versions"
}
]
},
{
"name": {
"value": "cjson",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.7.18-3.1",
"evidence": "/affected/17/versions"
},
{
"value": "1.7.18-4",
"evidence": "/affected/17/versions"
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{
"value": "1.7.19-1",
"evidence": "/affected/17/versions"
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{
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},
{
"name": {
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},
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{
"value": "3.18-2",
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{
"value": "3.19.1-2",
"evidence": "/affected/18/versions"
},
{
"value": "3.20-2",
"evidence": "/affected/18/versions"
}
]
},
{
"name": {
"value": "mapcache",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.14.1-3",
"evidence": "/affected/19/versions"
},
{
"value": "1.14.1-3build1",
"evidence": "/affected/19/versions"
},
{
"value": "1.14.1-3build2",
"evidence": "/affected/19/versions"
}
]
},
{
"name": {
"value": "sail-ocaml",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.19.1+dfsg5-1",
"evidence": "/affected/20/versions"
},
{
"value": "0.19.1+dfsg5-1build2",
"evidence": "/affected/20/versions"
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{
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],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-67216",
"aliases": [
"UBUNTU-CVE-2026-67216"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"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",
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},
{
"type": "Ubuntu",
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}
],
"affected": [
{
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{
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"events": [
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}
]
}
],
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},
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],
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},
"ecosystem_specific": {
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}
},
{
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{
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],
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},
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
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{
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{
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}
]
}
},
{
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}
],
"package": {
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"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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{
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},
{
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}
]
}
},
{
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{
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{
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}
]
}
],
"package": {
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},
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"1.6.1-1"
],
"database_specific": {
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},
"ecosystem_specific": {
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{
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{
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}
},
{
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{
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],
"package": {
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"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
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"1.7.10-1.1ubuntu0.1~esm1"
],
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},
"ecosystem_specific": {
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{
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}
},
{
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{
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/iperf3?arch=source&distro=esm-apps%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"versions": [
"3.6-2",
"3.7-1",
"3.7-2",
"3.7-3",
"3.7-3ubuntu0.1~esm1",
"3.7-3ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67216.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "iperf3",
"binary_version": "3.7-3ubuntu0.1~esm2"
},
{
"binary_name": "libiperf0",
"binary_version": "3.7-3ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
"name": "mapcache",
"purl": "pkg:deb/ubuntu/mapcache?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"1.8.0-1",
"1.8.0-1build2",
"1.10.0-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-67216.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libapache2-mod-mapcache",
"binary_version": "1.10.0-1"
},
{
"binary_name": "libmapcache1",
"binary_version": "1.10.0-1"
},
{
"binary_name": "mapcache-cgi",
"binary_version": "1.10.0-1"
},
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],
"modified": "2026-10-17T12:56:41.451379685Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-67216",
"https://www.cve.org/CVERecord?id=CVE-2026-67216",
"https://joshua.hu/cjson-json-parser-cve-vulnerabilities"
]
},
"related_cves": [
{
"value": "CVE-2026-67216",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/2/score"
},
"source_id": "core-osv",
"document_id": 355963,
"published_at": "2026-07-29T14:16:00+00:00"
}