ruby-oj: Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem
CVE-2026-54901 is fixed in ruby-oj on 1 platform, first by DEBIAN-CVE-2026-54901, released July 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2, Oj::Parser in usual mode does not mark array_class and hash_class references during garbage collection, leading to Use-After-Free. If GC runs after the class is assigned but before a parse, the class object is reclaimed, leaving the parser holding a dangling VALUE. The subsequent parse call dereferences the freed object, producing a segfault. This issue has been fixed in version 3.17.2.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| ruby-oj · Debian 12.15 (bookworm) | 3.14.2-1+deb12u1 | DEBIAN-CVE-2026-54901 | Jul 3, 2026 |
| ruby-oj · Debian 13.5 (trixie) | 3.16.3-1+deb13u1 | DEBIAN-CVE-2026-54901 | Jul 3, 2026 |
| ruby-oj · Debian 14 | 3.17.3-1 | DEBIAN-CVE-2026-54901 | Jul 3, 2026 |
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