ubuntu-cve-2026-54500
Vulnerability from osv_ubuntu
Published
2026-07-01 00:16
Modified
2026-07-01 00:16
Summary
Details
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, b, populating it with the attribute name, and then freeing it — but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.
Severity
5.3 (Medium)
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 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it \u2014 but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is \u003e= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.",
"id": "UBUNTU-CVE-2026-54500",
"modified": "2026-07-01T00:16:00Z",
"published": "2026-07-01T00:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54500"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54500"
},
{
"type": "REPORT",
"url": "https://github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54500"
]
}
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
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- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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