PT-2026-26298 · Ruby · Json+1

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

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

CLEANSTART-2026-CQ39708

CLEANSTART-2026-DV49899

CLEANSTART-2026-GE08280

CLEANSTART-2026-OQ84658

CLEANSTART-2026-RZ30606

CVE-2026-33210

GHSA-3M6G-2423-7CP3

Affected Products

Json

Ruby

References · 100

• 🔥 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://nvd.nist.gov/vuln/detail/CVE-2026-33810 · Security Note
• https://osv.dev/vulnerability/GHSA-3m6g-2423-7cp3 · Vendor Advisory
• https://osv.dev/vulnerability/CLEANSTART-2026-RZ30606 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-45993 · Security Note
• https://osv.dev/vulnerability/ALSA-2026:20596 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-61771 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33210 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-61919 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33870 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-61772 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-61728 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-32283 · Security Note