CVE-2026-54898 - Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation

CVE-2026-54898 - Oj: Use-After-Free in Oj::Parser SAJ Callback via Input Mutation

https://cvefeed.io/rssfeed/latest.atom / Wed, 07/01/2026 - 04:03
CVE ID :CVE-2026-54898
Published : June 30, 2026, 11:24 p.m. | 1 hour, 19 minutes ago
Description :Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.2,Oj::Parser#parse is vulnerable to a heap use-after-free when a SAJ/SAJ2 callback mutates the input JSON string during parsing. The C engine holds a raw const byte * pointer into the Ruby string's internal buffer. If a callback (e.g. hash_start) resizes the string — for example by calling String#replace with a longer value — Ruby reallocates the string buffer and frees the old one. The C parser's pointer is left dangling; the next character read at parser.c:607 is a use-after-free. This issue has been fixed in version 3.17.2.
Severity: 0.0 | NA
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