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CVE-2026-13221 Perl versions through 5.43.9 produce silently incorrect regular expression matches when an alternation of more than 65535 fixed string branches is compiled into a trie in Perl_study_chunk

🗓️ 13 Jul 2026 15:40:11Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 2 Views

Perl up to 5.43.9 mismatches regex alternations over 65535 branches in a trie, causing wrong matches.

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