What is CVE-2026-8376?

CVE-2026-8376 is a critical-severity vulnerability in Perl, classified under Integer Overflow to Buffer Overflow. CVSS score: 9.8/10. Published 2026-05-26.

How severe is CVE-2026-8376?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Perl

CVE-2026-8376

Perl versions through 5.43.10 have a heap buffer overflow when compiling regular expressions with a repeated fixed string on 32-bit builds. Perl_study_chunk in regcomp_study.c checked the size of the joined substring buffer in characters…

EPSS: 0.000 (15.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Perl
Shay Perl — versions 0

Weakness classification (CWE)

CWE-680 — Integer Overflow to Buffer Overflow

References

9b29abf9-4ab0-4765-b253-1875cd9b441e (Patch, patch)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-8376?: CVE-2026-8376 is a critical-severity vulnerability in Perl, classified under Integer Overflow to Buffer Overflow. CVSS score: 9.8/10. Published 2026-05-26.
How severe is CVE-2026-8376?: Critical severity. CVSS v3 base score is 9.8 out of 10.