CVE-2026-33210
Ruby JSON has a format string injection vulnerability
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.
INFO
Published Date :
March 20, 2026, 11:16 p.m.
Last Modified :
March 27, 2026, 9:25 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-33210
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Ruby JSON gem to version 2.15.2.1 or later.
- Update Ruby JSON gem to version 2.17.1.2 or later.
- Update Ruby JSON gem to version 2.19.2 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-33210.
| URL | Resource |
|---|---|
| https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 | Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-33210 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-33210
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-33210 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-33210 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:ruby-lang:json:*:*:*:*:*:ruby:*:* versions from (including) 2.14.0 up to (excluding) 2.15.2.1 *cpe:2.3:a:ruby-lang:json:*:*:*:*:*:ruby:*:* versions from (including) 2.16.0 up to (excluding) 2.17.1.2 *cpe:2.3:a:ruby-lang:json:*:*:*:*:*:ruby:*:* versions from (including) 2.18.0 up to (excluding) 2.19.2 Added Reference Type GitHub, Inc.: https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3 Types: Mitigation, Vendor Advisory -
New CVE Received by [email protected]
Mar. 20, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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 Added CWE CWE-134 Added Reference https://github.com/ruby/json/security/advisories/GHSA-3m6g-2423-7cp3