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

Aug 7, 2026

Status

Received

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