CVSS 4.0
8.3 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:NCVE-2026-33210
High (8.3) in ruby-lang json. EPSS 0.9% chance of exploitation in the next 30 days. Fixed in json 2.15.2.1, 2.17.1.2, 2.19.2.
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.
Severity
CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H- EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 58% of CVEs (scores of 2026-10-31)
- CWE
- CWE-134
- Published
- Modified
- Record from
- the NVD, synced
Affected
- ruby-lang:json
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3m6g-2423-7cp3 | RubyGems | json | >=2.18.0 <2.19.2 | 2.19.2 |
| GHSA-3m6g-2423-7cp3 | RubyGems | json | >=2.16.0 <2.17.1.2 | 2.17.1.2 |
| GHSA-3m6g-2423-7cp3 | RubyGems | json | >=2.14.0 <2.15.2.1 | 2.15.2.1 |