What is CVE-2026-19487?

CVE-2026-19487 is a medium-severity vulnerability, classified under Always-Incorrect Control Flow Implementation. CVSS score: 5.3/10. Published 2026-08-13.

How severe is CVE-2026-19487?

Medium severity. CVSS v3 base score is 5.3 out of 10.

CVE-2026-19487

CVE-2026-19487

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. The prescan walks the subject for positions where the full pattern…

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

Weakness classification (CWE)

CWE-670 — Always-Incorrect Control Flow Implementation

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (patch)
9b29abf9-4ab0-4765-b253-1875cd9b441e (issue-tracking)

Frequently asked questions

What is CVE-2026-19487?: CVE-2026-19487 is a medium-severity vulnerability, classified under Always-Incorrect Control Flow Implementation. CVSS score: 5.3/10. Published 2026-08-13.
How severe is CVE-2026-19487?: Medium severity. CVSS v3 base score is 5.3 out of 10.