CVE-2026-33210
CRITICALRuby JSON has a format string injection vulnerability
Title source: cnaDescription
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.
Scores
CVSS v3
9.1
EPSS
0.0004
EPSS Percentile
10.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-134
Status
published
Products (5)
ruby/json
>= 2.14.0, < 2.15.2.1
ruby/json
>= 2.16.0, < 2.17.1.2
ruby/json
>= 2.18.0, < 2.19.2
ruby-lang/json
2.14.0 - 2.15.2.1
rubygems/json
2.18.0 - 2.19.2RubyGems
Published
Mar 20, 2026
Tracked Since
Mar 21, 2026