Medium
simdjson — security advisory
simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.
- Products
- simdjson
- Affected versions
- 0.2.1-1, 0.2.1-1build1, 0.7.1-1, 1.0.2-2, 3.12.3-1, 3.13.0-1.1, 3.2.1-1, 3.2.3-1, 3.6.3-1, 3.6.4-1, 4.2.4-1, 4.6.4-1, 4.6.4-1build1, 4.6.4-1build2, 4.6.6-1, 4.6.7-1, 4.6.8-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-88358
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:30 UTC · Revision 1
Source evidence
simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.
osv:UBUNTU-CVE-2026-88358
simdjson
Fixed versions: Not specified
simdjson
Fixed versions: Not specified
simdjson
Fixed versions: Not specified
simdjson
Fixed versions: Not specified
simdjson
Fixed versions: Not specified
Complete source record
{
"id": "59969cb7f99a1a4b37365ac66e7191f565275da85579b7d765b23d156643af8d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-88358",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-88358",
"summary": "simdjson 4.6.1 contains a one-byte out-of-bounds read vulnerability in dom::parser::parse_unpadded(). A specially crafted truncated JSON document whose final structural token closes a nested array or object can cause json_iterator::walk_document() to access buf[len] after the input buffer has been exhausted. This results in a heap out-of-bounds read and may cause application termination, leading to denial of service.",
"evidence": "osv:UBUNTU-CVE-2026-88358",
"products": [
{
"name": {
"value": "simdjson",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.2.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.2.1-1build1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
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"evidence": "/affected/1/package/name"
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"affected_versions": [
{
"value": "0.7.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.0.2-2",
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}
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},
{
"name": {
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"affected_versions": [
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"evidence": "/affected/2/versions"
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{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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{
"value": "3.6.4-1",
"evidence": "/affected/2/versions"
}
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},
{
"name": {
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},
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"affected_versions": [
{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
},
{
"value": "4.6.4-1build1",
"evidence": "/affected/3/versions"
},
{
"value": "4.6.4-1build2",
"evidence": "/affected/3/versions"
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{
"value": "4.6.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.6.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "4.6.8-1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "3.12.3-1",
"evidence": "/affected/4/versions"
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{
"value": "3.13.0-1.1",
"evidence": "/affected/4/versions"
},
{
"value": "4.2.4-1",
"evidence": "/affected/4/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-88358",
"aliases": [
"UBUNTU-CVE-2026-88358"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "simdjson",
"purl": "pkg:deb/ubuntu/simdjson?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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"0.2.1-1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88358.json"
},
"ecosystem_specific": {
"binaries": [
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"binary_name": "libsimdjson0",
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}
},
{
"ranges": [
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"package": {
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"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
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],
"database_specific": {
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},
"ecosystem_specific": {
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},
{
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"package": {
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"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
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"3.2.3-1",
"3.6.3-1",
"3.6.4-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88358.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsimdjson19",
"binary_version": "3.6.4-1"
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},
{
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"package": {
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"purl": "pkg:deb/ubuntu/simdjson?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"4.2.4-1",
"4.6.4-1",
"4.6.4-1build1",
"4.6.4-1build2",
"4.6.6-1",
"4.6.7-1",
"4.6.8-1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsimdjson33",
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}
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{
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"package": {
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"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"3.12.3-1",
"3.13.0-1.1",
"4.2.4-1"
],
"database_specific": {
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},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsimdjson29",
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}
]
}
}
],
"modified": "2026-10-17T13:01:15.527184143Z",
"provider": "osv",
"upstream": [
"CVE-2026-88358"
],
"references": [
"https://ubuntu.com/security/CVE-2026-88358",
"https://www.cve.org/CVERecord?id=CVE-2026-88358"
]
},
"related_cves": [
{
"value": "CVE-2026-88358",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361401,
"published_at": "2026-09-24T16:17:00+00:00"
}