CVE-2026-71847

Ruby JSON is a JSON implementation for Ruby. From 2.20.0 until 2.21.2, Ruby's JSON native C extension clears the consumed JSON::ResumableParser input buffer but leaves state.start, state.cursor, and state.end pointing into released storage. When partial_value reconstructs an incomplete object containing duplicate keys, the duplicate-key warning path calls cursor_position, which dereferences those stale pointers. This results in a heap-use-after-free and can terminate the Ruby process. An attacker who can supply JSON stream data to an application using JSON::ResumableParser may cause process termination when the application calls partial_value on incomplete attacker-controlled input containing duplicate object keys. This issue has been fixed in version 2.21.2.

• CWE-416

• https://github.com/ruby/json/security/advisories/GHSA-9hj4-r449-hfvc
• https://github.com/ruby/json/security/advisories/GHSA-9hj4-r449-hfvc

Published

Aug 7, 2026

Last Modified

Sep 18, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-7182Diagram's export module is vulnerable to Path Traversal in s…9.2
• CVE-2026-7183A vulnerability has been found in aligungr UERANSIM up to 3.…5.5
• CVE-2026-71832Aria2 version 1.37.0 and below is affected by a Divide By Ze…6.2
• CVE-2026-7184Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.1…6.5
• CVE-2026-71845A flaw was found in insights-client. The setDefault() functi…7.7
• CVE-2026-71846A flaw was found in insights-client. The component's Service…6.5
• CVE-2026-71848Hono is a Web application framework that provides support fo…5.3
• CVE-2026-71849Hono is a Web application framework that provides support fo…3.7
• CVE-2026-7185A validation vulnerability has been identified in certain we…6
• CVE-2026-71850Hono is a Web application framework that provides support fo…4.8
• CVE-2026-71851crypto-js is a JavaScript library of crypto standards. Versi…9
• CVE-2026-71852pypdf is a free and open-source pure-python PDF library. Pri…4.8