ruby-oj: Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem
CVE-2026-54900 is fixed in ruby-oj on 1 platform, first by DEBIAN-CVE-2026-54900, 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, when in usual mode with create_id enabled, Oj::Parser#parse is vulnerable to heap corruption via a negative-size memcpy. When a JSON object key is exactly 65,535 bytes long, an integer truncation in form_attr (usual.c:63) converts the length to -1 before passing it to memcpy. This causes memcpy to copy SIZE_MAX bytes (interpreted as a huge size_t), corrupting heap memory and crashing the process. The 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-2026-54900 | Jul 3, 2026 |
| ruby-oj · Debian 13.5 (trixie) | 3.16.3-1+deb13u1 | DEBIAN-CVE-2026-54900 | Jul 3, 2026 |
| ruby-oj · Debian 14 | 3.17.3-1 | DEBIAN-CVE-2026-54900 | Jul 3, 2026 |
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