CVE-2026-54500: Oj: intern.c form_attr (uninitialized stack read)

June 19, 2026

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.

References

github.com/advisories/GHSA-fm7p-mprw-wjm9
github.com/ohler55/oj/security/advisories/GHSA-fm7p-mprw-wjm9
nvd.nist.gov/vuln/detail/CVE-2026-54500

Code Behaviors & Features

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