Secuno
ENNL
Book demo

CVE-2026-33210

Ruby-lang Json vulnerability

9.1 CRITICALEPSS 1.01%
  1. Published20 Mar 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Ruby-lang Json≥ 2.14.0 < 2.15.2.1 · ≥ 2.16.0 < 2.17.1.2 · ≥ 2.18.0 < 2.19.2

Remediation

Fixed in
Ruby-lang Json≥ 2.15.2.1

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-767539.8
A format string vulnerability in an affected service interface of HPE Networking…
CVE-2026-767229.8
Uncontrolled Format string vulnerabilities exist in the affected interface of HPE…
CVE-2026-846918.7
A flaw was found in Red Hat Ansible Automation Platform's automation- controller. The…
CVE-2026-737828.8
A format string vulnerability exists in the command line interface of AOS-CX that could…
CVE-2026-815748.2
In CodeMeter Runtime before versions 8.41a and 9.10, the logger does not sanitize input…
CVE-2026-630739.8
Issue summary: OpenSSL CMP response validation passed an unexpected response sender…

Frequently asked

Is CVE-2026-33210 being actively exploited?

CVE-2026-33210 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.01%.

How severe is CVE-2026-33210?

CVE-2026-33210 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 1.01% probability of exploitation.

Which products are affected by CVE-2026-33210?

Affected products include Ruby-lang Json.

How do I fix CVE-2026-33210?

Upgrade affected software to a fixed version, for example Ruby-lang Json 2.15.2.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-33210 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.