MediumFix available
ruby-oj — security advisory
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.
- Products
- ruby-oj
- Affected versions
- 3.14.2-1, 3.16.12-1, 3.16.15-1, 3.16.16-1, 3.16.3-1, 3.17.0-1, 3.17.1-1
- Fixed versions
- 3.14.2-1+deb12u1, 3.16.3-1+deb13u1, 3.17.3-1
- CVEs
- CVE-2026-54903
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:17 UTC · Revision 2
Source evidence
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.
osv:DEBIAN-CVE-2026-54903
ruby-oj
Fixed versions: 3.14.2-1+deb12u1
ruby-oj
Fixed versions: 3.16.3-1+deb13u1
ruby-oj
Fixed versions: 3.17.3-1
Complete source record
{
"id": "93fe7ac6699fb050f9752af68c6df514a6b130a49c2c70887c67719117a4fd71",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-54903",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-54903",
"summary": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. The issue has been fixed in version 3.17.2.",
"evidence": "osv:DEBIAN-CVE-2026-54903",
"products": [
{
"name": {
"value": "ruby-oj",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.14.2-1+deb12u1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
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"evidence": "/affected/0/versions"
}
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{
"name": {
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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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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
},
{
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"evidence": "/affected/2/versions"
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],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-54903",
"aliases": [
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"metrics": [
{
"type": "CVSS_V4",
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}
],
"affected": [
{
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"events": [
{
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{
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}
],
"package": {
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"purl": "pkg:deb/debian/ruby-oj?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
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"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54903.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
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"events": [
{
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{
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}
],
"package": {
"name": "ruby-oj",
"purl": "pkg:deb/debian/ruby-oj?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"3.16.3-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-54903.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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{
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],
"package": {
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"purl": "pkg:deb/debian/ruby-oj?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
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"3.16.15-1",
"3.16.16-1",
"3.16.3-1",
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],
"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T11:47:25.363092911Z",
"provider": "osv",
"upstream": [
"CVE-2026-54903"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-54903"
]
},
"related_cves": [
{
"value": "CVE-2026-54903",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450791,
"published_at": "2026-07-01T00:16:33.707+00:00"
}