CVE-2026-54500 - Oj: intern.c form_attr has an uninitialized stack read

CVE-2026-54500 - Oj: intern.c form_attr has an uninitialized stack read

https://cvefeed.io/rssfeed/latest.atom / Wed, 07/01/2026 - 04:03
CVE ID :CVE-2026-54500
Published : June 30, 2026, 11:08 p.m. | 1 hour, 34 minutes ago
Description :Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions prior to 3.17.3, Oj.load in :object mode reads uninitialized stack memory (and, for long keys, reads out of bounds) when parsing a JSON object whose key is 254 bytes or longer. The interned bytes can surface to the caller, disclosing process stack memory. In ext/oj/intern.c, form_attr() handles the long-key path by allocating a heap buffer, `b`, populating it with the attribute name, and then freeing it — but it passed the uninitialized stack buffer buf (not b) to rb_intern3(). rb_intern3 therefore reads len + 1 bytes of uninitialized stack memory. When the key length is >= 256, it also reads out of bounds past the 256-byte buf. The resulting bytes are interned and can reach the caller via the produced Symbol or via the EncodingError message raised on invalid UTF-8, leaking process stack contents. This issue has been fixed in version 3.17.3.
Severity: 0.0 | NA
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