Microsoft Security Response Center 中文 关注 CVE-2026-13221：Perl 5.43.9 及更早版本在将超过 65535 个固定字符串分支的交替模式编译到 Perl_study_chunk 中的 trie 时，会产生静默错误的正则表达式匹配结果。 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 msrc.microsoft.com
