Low
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::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.
- Products
- ruby-oj
- Affected versions
- 2.0.10-1, 2.1.4-1, 2.12.10-3, 2.12.10-3build1, 2.12.10-4, 2.12.10-4build1, 2.17.4-1, 2.4.0-1, 2.5.3-1, 3.10.1-1, 3.10.1-1build1, 3.11.0-1, 3.13.7-1, 3.13.7-1build1, 3.13.9-1, 3.13.9-1build1, 3.15.0-1, 3.16.1-1, 3.16.12-1, 3.16.15-1, 3.16.3-1, 3.16.3-1build1, 3.16.3-1build2, 3.16.3-1build3, 3.17.0-1, 3.17.1-1, 3.17.3-1, 3.17.4-1, 3.4.0-1, 3.4.0-1build1, 3.8.1-1, 3.9.1-1, 3.9.2-1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54898
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:08 UTC · Revision 1
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::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.
osv:UBUNTU-CVE-2026-54898
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
ruby-oj
Fixed versions: Not specified
Complete source record
{
"id": "15111078cb7d6acf6fb5510118d0127d027d1c62319caa697fe7024ec291343d",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-54898",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-54898",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-54898",
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"severity": "low",
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],
"modified": "2026-10-17T13:00:26.036010712Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-54898",
"https://www.cve.org/CVERecord?id=CVE-2026-54898",
"https://github.com/ohler55/oj/security/advisories/GHSA-q2gm-54r6-8fwm"
]
},
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"evidence": "/upstream"
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"source_id": "core-osv",
"document_id": 360534,
"published_at": "2026-07-01T00:16:00+00:00"
}