PT-2026-26298 · Ruby+1 · Json+2

Davidkorczynski · CVE-2026-33210 · Published 2026-03-19 · Updated 2026-05-26

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Ruby JSON versions 2.14.0 through 2.15.2 Ruby JSON versions 2.17.1 through 2.17.1.2 Ruby JSON versions 2.19.0 through 2.19.2

Description Ruby JSON is a JSON implementation for Ruby. A format string injection issue exists when the allow duplicate key: false parsing option is used to parse user-supplied documents. This can lead to denial of service attacks or information disclosure. The allow duplicate key: false option is not enabled by default, so users who have not specifically enabled it are not affected.

Recommendations Ruby JSON versions 2.14.0 through 2.15.2: Update to version 2.15.2.1 or later. Ruby JSON versions 2.17.1 through 2.17.1.2: Update to version 2.17.1.2 or later. Ruby JSON versions 2.19.0 through 2.19.2: Update to version 2.19.2 or later. Avoid using the allow duplicate key: false parsing option.

Exploit

Fix

DoS

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

ALSA-2026:20596

ALSA-2026:20606

CLEANSTART-2026-CQ39708

CLEANSTART-2026-DV49899

CLEANSTART-2026-GE08280

CLEANSTART-2026-OQ84658

CLEANSTART-2026-RZ30606

CVE-2026-33210

GHSA-3M6G-2423-7CP3

RHSA-2026:20596

RHSA-2026:20606

Affected Products

Json

Rocky Linux

Ruby

References · 107

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33210.json · Exploit
• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json/CVE-2026-33210.yml · Exploit
• https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 · Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:20606 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-33210 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33870 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:20606 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-20596.html · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-61772 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-45993 · Security Note
• https://osv.dev/vulnerability/CVE-2026-33210 · Vendor Advisory
• https://osv.dev/vulnerability/CLEANSTART-2026-RZ30606 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33210 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33210 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-32289 · Security Note