ruby-json: Ruby JSON is a JSON implementation for Ruby
CVE-2026-71847 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-71847, released August 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| hawk2 · opensuse-leap 16.0 | 2.7.2+git.1788518533.7d4dadd6-160000.1.1 | OPENSUSE-SU-2026:22068-1 | Nov 7, 2026 |
| hawk2 · sles 16.0 | 2.7.2+git.1788518533.7d4dadd6-160000.1.1 | SUSE-SU-2026:24195-1 | Nov 7, 2026 |
| ruby-json · Debian 14 | 2.21.2+dfsg-1 | DEBIAN-CVE-2026-71847 | Aug 13, 2026 |
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