CVE-2026-33210: CWE-134: Use of Externally-Controlled Format String in ruby json
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
AI Analysis
Technical Summary
CVE-2026-33210 describes a format string injection vulnerability in the Ruby JSON library affecting versions >=2.14.0 <2.15.2.1, >=2.15.2.1 <2.17.1.2, and >=2.17.1.2 <2.19.2. The vulnerability arises when the allow_duplicate_key: false parsing option is used on user-supplied JSON documents, which can lead to denial of service or information disclosure. This vulnerability is tracked as CWE-134 (Use of Externally-Controlled Format String). Official patches have been released in versions 2.15.2.1, 2.17.1.2, and 2.19.2. Red Hat advisories confirm the availability of fixes and provide updated packages for affected Red Hat Enterprise Linux distributions.
Potential Impact
Exploitation of this vulnerability can result in denial of service or information disclosure when parsing malicious JSON input with the allow_duplicate_key: false option. The CVSS 4.0 base score is 8.3 (high severity), indicating a significant security impact without requiring user interaction or privileges. No known exploits are reported in the wild at this time.
Mitigation Recommendations
This vulnerability has been officially patched in Ruby JSON versions 2.15.2.1, 2.17.1.2, and 2.19.2. Users should upgrade to these or later versions to remediate the issue. Red Hat has released updated ruby4.0 packages for Red Hat Enterprise Linux 10 and related distributions addressing this vulnerability. Applying these vendor-provided updates is the recommended remediation. Patch status is confirmed by vendor advisories.
CVE-2026-33210: CWE-134: Use of Externally-Controlled Format String in ruby json
Description
Ruby JSON is a JSON implementation for Ruby. From version 2.14.0 to before versions 2.15.2.1, 2.17.1.2, and 2.19.2, a format string injection vulnerability can lead to denial of service attacks or information disclosure, when the allow_duplicate_key: false parsing option is used to parse user supplied documents. This issue has been patched in versions 2.15.2.1, 2.17.1.2, and 2.19.2.
CVSS v4.0
Score 8.3high
Affected software
pkg:gem/jsonRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-33210 describes a format string injection vulnerability in the Ruby JSON library affecting versions >=2.14.0 <2.15.2.1, >=2.15.2.1 <2.17.1.2, and >=2.17.1.2 <2.19.2. The vulnerability arises when the allow_duplicate_key: false parsing option is used on user-supplied JSON documents, which can lead to denial of service or information disclosure. This vulnerability is tracked as CWE-134 (Use of Externally-Controlled Format String). Official patches have been released in versions 2.15.2.1, 2.17.1.2, and 2.19.2. Red Hat advisories confirm the availability of fixes and provide updated packages for affected Red Hat Enterprise Linux distributions.
Potential Impact
Exploitation of this vulnerability can result in denial of service or information disclosure when parsing malicious JSON input with the allow_duplicate_key: false option. The CVSS 4.0 base score is 8.3 (high severity), indicating a significant security impact without requiring user interaction or privileges. No known exploits are reported in the wild at this time.
Mitigation Recommendations
This vulnerability has been officially patched in Ruby JSON versions 2.15.2.1, 2.17.1.2, and 2.19.2. Users should upgrade to these or later versions to remediate the issue. Red Hat has released updated ruby4.0 packages for Red Hat Enterprise Linux 10 and related distributions addressing this vulnerability. Applying these vendor-provided updates is the recommended remediation. Patch status is confirmed by vendor advisories.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-17T23:23:58.313Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-33210","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:20606","vendor":"Red Hat"},{"url":"https://access.redhat.com/errata/RHSA-2026:20596","vendor":"Red Hat"}]
Threat ID: 69bdd4681188d0bb0cbbf670
Added to database: 03/20/2026, 23:12:40 UTC
Last enriched: 07/22/2026, 22:32:14 UTC
Last updated: 08/03/2026, 07:17:56 UTC
Views: 179
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