CVE-2026-54903: CWE-190: Integer Overflow or Wraparound in ohler55 oj
Oj (Optimized JSON) is a Ruby gem for JSON parsing and object marshalling. Versions prior to 3.17.2 contain an integer overflow vulnerability in the buf_append_string function, which can cause heap corruption when parsing JSON strings larger than 2 GB. This flaw leads to an out-of-bounds memory copy and process crash. The issue is fixed in version 3.17.2.
AI Analysis
Technical Summary
CVE-2026-54903 describes an integer overflow vulnerability (CWE-190) in the Oj Ruby gem before version 3.17.2. The vulnerability occurs in the buf_append_string function (buf.h:61) when parsing JSON strings longer than 2 GB. The overflow converts the string length to a large negative size_t value, causing memcpy to copy an excessive amount of data out of bounds. This results in heap corruption and process crashes. The vulnerability has been addressed in version 3.17.2.
Potential Impact
Exploitation of this vulnerability can cause the Oj parser process to crash and corrupt adjacent heap memory. This may lead to denial of service or potential memory corruption issues. There is no indication of remote code execution or data disclosure from the provided data.
Mitigation Recommendations
Upgrade Oj to version 3.17.2 or later, where this integer overflow vulnerability has been fixed. Patch status is confirmed by the vendor advisory stating the fix is included in version 3.17.2. No other mitigation is indicated.
CVE-2026-54903: CWE-190: Integer Overflow or Wraparound in ohler55 oj
Description
Oj (Optimized JSON) is a Ruby gem for JSON parsing and object marshalling. Versions prior to 3.17.2 contain an integer overflow vulnerability in the buf_append_string function, which can cause heap corruption when parsing JSON strings larger than 2 GB. This flaw leads to an out-of-bounds memory copy and process crash. The issue is fixed in version 3.17.2.
CVSS v4.0
Score 6.3medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-54903 describes an integer overflow vulnerability (CWE-190) in the Oj Ruby gem before version 3.17.2. The vulnerability occurs in the buf_append_string function (buf.h:61) when parsing JSON strings longer than 2 GB. The overflow converts the string length to a large negative size_t value, causing memcpy to copy an excessive amount of data out of bounds. This results in heap corruption and process crashes. The vulnerability has been addressed in version 3.17.2.
Potential Impact
Exploitation of this vulnerability can cause the Oj parser process to crash and corrupt adjacent heap memory. This may lead to denial of service or potential memory corruption issues. There is no indication of remote code execution or data disclosure from the provided data.
Mitigation Recommendations
Upgrade Oj to version 3.17.2 or later, where this integer overflow vulnerability has been fixed. Patch status is confirmed by the vendor advisory stating the fix is included in version 3.17.2. No other mitigation is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-16T13:49:33.555Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a445a0927e9c7971999d8a3
Added to database: 07/01/2026, 00:06:33 UTC
Last enriched: 07/01/2026, 00:21:49 UTC
Last updated: 07/01/2026, 00:21:49 UTC
Views: 3
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