Fix: Potential Vulnerability in Cloned Function #733
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Description
This PR fixes a security vulnerability in concat_opt_exact_str() that was cloned from oniguruma but did not receive the security patch. The original issue was reported and fixed under kkos/oniguruma@cbe9f8b.
This PR applies the same patch to eliminate the vulnerability.
References
https://nvd.nist.gov/vuln/detail/CVE-2020-26159
kkos/oniguruma@cbe9f8b