CVE-2026-33210
HIGH
GHSA-3m6g-2423-7cp3
CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3Description
### Impact A format string injection vulnerability than that 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 option isn't the default, if you didn't opt-in to use it, you are not impacted. ### Patches Patched in `2.19.2`. ### Workarounds The issue can be avoided by not using the `allow_duplicate_key: false` parsing option.
Analysis
A format string injection vulnerability exists in the Ruby JSON gem that can lead to denial of service attacks or information disclosure when parsing user-supplied documents with the non-default 'allow_duplicate_key: false' parsing option enabled. The vulnerability affects users of the pkg:rubygems/json package who have explicitly opted into using this specific parsing configuration. …
Sign in for full analysis, threat intelligence, and remediation guidance.
Remediation
Within 24 hours: Identify all Ruby applications using the json gem with 'allow_duplicate_key: false' option enabled through code review and dependency scanning. Within 7 days: Implement compensating controls such as input validation, disabling the vulnerable parsing option if not business-critical, or isolating affected systems from untrusted input sources. …
Sign in for detailed remediation steps.
Priority Score
Share
External POC / Exploit Code
Leaving vuln.today