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Perl versions from 5.9.4 before 5.41.9 produce incorrect regular expression match results when a stale failure flag ends the Aho-Corasick prescan early in S_find_byclass

🗓️ 23 Aug 2026 22:03:46Reported by MicrosoftType 
mscve
 mscve
🔗 msrc.microsoft.com👁 92 Views

Perl before 5.41.9 returns incorrect regex match results due to stale flag in Aho-Corasick prescan.

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10 Sep 2026 10:33Current
5.2Medium risk
Vulners AI Score5.2
CVSS 3.15.3
EPSS0.00418
SSVC
92