https://seclists.org/oss-sec/2026/q3/480: CVE-2026-19487: Perl versions from 5.9.4 befo5.41.9 produce incorct gular expssion match sults when a stale failuflag ends the Aho-Corasick pscan early in S_find_byclass
Published Aug 13, 2026
·Updated
Affected Software
1 affected component
Perl Perl>5.9.4<5.41.9
Frequently Asked Questions
1
What is the severity of CVE-2026-19487?
CVE-2026-19487 has not been assigned an explicit severity score, but it affects the regular expression matching functionality in certain Perl versions.
2
How do I fix CVE-2026-19487?
To mitigate CVE-2026-19487, upgrade your Perl version to 5.41.9 or later, as earlier versions are vulnerable.
3
What versions of Perl are affected by CVE-2026-19487?
CVE-2026-19487 affects Perl versions from 5.9.4 up to, but not including, 5.41.9.
4
What kind of vulnerability is CVE-2026-19487?
CVE-2026-19487 is a vulnerability related to incorrect results in regular expression matching due to a stale failure flag.
5
Is there a workaround for CVE-2026-19487 if I cannot upgrade Perl?
There are no known effective workarounds for CVE-2026-19487 other than upgrading to a patched version of Perl.