UBUNTU-CVE-2026-54898 (CVE-2026-54898)
Vulnerability from osv_ubuntu – Published: 2026-07-01 00:16 – Updated: 2026-07-01 00:16 – Source website
VLAI
Details
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "2.5.3-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@2.5.3-1?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.0.10-1",
"2.1.4-1",
"2.4.0-1",
"2.5.3-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "2.12.10-4build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@2.12.10-4build1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.12.10-3",
"2.12.10-3build1",
"2.12.10-4",
"2.12.10-4build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.4.0-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.4.0-1build1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.17.4-1",
"3.4.0-1",
"3.4.0-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.10.1-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.10.1-1build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.8.1-1",
"3.9.1-1",
"3.9.2-1",
"3.10.1-1",
"3.10.1-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.13.9-1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.13.9-1build1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.11.0-1",
"3.13.7-1",
"3.13.7-1build1",
"3.13.9-1",
"3.13.9-1build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.16.3-1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.16.3-1build2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.15.0-1",
"3.16.1-1",
"3.16.3-1",
"3.16.3-1build1",
"3.16.3-1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.16.3-1build3"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.16.3-1build3?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.16.3-1build3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "ruby-oj",
"binary_version": "3.16.15-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "ruby-oj",
"purl": "pkg:deb/ubuntu/ruby-oj@3.16.15-1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.16.3-1build3",
"3.16.12-1",
"3.16.15-1"
]
}
],
"aliases": [],
"details": "Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string\u0027s internal buffer. If a callback (e.g. hash_start) resizes the string \u2014 for example by calling String#replace with a longer value \u2014 Ruby reallocates the string buffer and frees the old one. The C parser\u0027s pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.",
"id": "UBUNTU-CVE-2026-54898",
"modified": "2026-07-01T00:16:00Z",
"published": "2026-07-01T00:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54898"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54898"
},
{
"type": "REPORT",
"url": "https://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54898"
]
}
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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