ruby-oj: Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem
CVE-2026-54903 is fixed in ruby-oj on 1 platform, first by DEBIAN-CVE-2026-54903, 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.load is vulnerable to heap corruption when parsing a JSON string longer than 2 GB. An integer overflow in buf_append_string (buf.h:61) converts the string length to a large negative size_t, causing memcpy to copy an astronomically large amount of data out of bounds. This crashes the process and can corrupt adjacent heap memory. 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-2026-54903 | Jul 3, 2026 |
| ruby-oj · Debian 13.5 (trixie) | 3.16.3-1+deb13u1 | DEBIAN-CVE-2026-54903 | Jul 3, 2026 |
| ruby-oj · Debian 14 | 3.17.3-1 | DEBIAN-CVE-2026-54903 | Jul 3, 2026 |
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