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rubygems/jsonRuby JSON has a format string injection vulnerability

Risk 47
Severity
8.3
EPSS
0.02%
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

Impact

A format string injection vulnerability than that lead to denial of service attacks or information disclosure, when the allowduplicatekey: 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 allowduplicatekey: false parsing option.

1 / 2
Source: GitHub
First published (updated )
CVE-2026-33210

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