CVE-2026-54902: OHLER55 Oj

Medium severity, CVSS 6.3. EPSS: 0.4% chance of exploitation in the next 30 days.

Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. Prior to version 3.17.2, is vulnerable to Use-After-Free when in SAJ mode. The Oj::Parser does not protect cached object keys (≥ 35 bytes) from garbage collection, and a Ruby callback that triggers GC inside hash_end can cause the key string to be reclaimed while the C parser still holds a pointer to it. The subsequent access to the freed string VALUE results in a segfault, confirmed by an RIP pointing to address 0x4242 (a canary-style pattern suggesting control over the freed memory's content). This issue has been fixed in version 3.17.2.

Affected products

• OHLER55 Oj: before 3.17.2 (fixed in 3.17.2)

Published 2026-07-01. Last modified 2026-07-01.