CVE-2026-54902 - Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback

CVE-2026-54902 - Oj: Use-After-Free in Oj::Parser SAJ Long Key Callback

https://cvefeed.io/rssfeed/latest.atom / Wed, 07/01/2026 - 04:03
CVE ID :CVE-2026-54902
Published : June 30, 2026, 11:40 p.m. | 1 hour, 2 minutes ago
Description :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.
Severity: 0.0 | NA
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