Review reviewHigh

CVE-2026-33210

ruby json, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9

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: 8.3
EPSS: 0.84%
CISA KEV: Not listed
Published: 2026.03.21

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.84%

Technical severityCVSS 8.3

Vulnerability overview

Affected product and versions

Product: ruby json, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9
Affected versions: >= >= 2.14.0, < 2.15.2.1, >= >= 2.16.0, < 2.17.1.2, >= >= 2.18.0, < 2.19.2, >= 2.14.0 < 2.15.2.1, >= 2.16.0 < 2.17.1.2, >= 2.18.0 < 2.19.2
Fixed versions: 2.15.2.1, 2.17.1.2, 2.19.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that ruby json, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

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
CWE: CWE-134