ruby-oj: Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem
CVE-2026-54896 is fixed in ruby-oj on 1 platform, first by DEBIAN-CVE-2026-54896, 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 object mode, Oj.dump is vulnerable to a heap buffer overflow when serializing Exception objects with a large :indent value. The serializer allocates a buffer sized for the object's attributes but does not account for the indent bytes added on each write. With indent: 5000, the accumulation of 5,000-byte indent strings overflows the 13,150-byte heap allocation, corrupting adjacent heap memory. 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-2026-54896 | Jul 3, 2026 |
| ruby-oj · Debian 13.5 (trixie) | 3.16.3-1+deb13u1 | DEBIAN-CVE-2026-54896 | Jul 3, 2026 |
| ruby-oj · Debian 14 | 3.17.3-1 | DEBIAN-CVE-2026-54896 | Jul 3, 2026 |
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