What is CVE-2026-8463?

CVE-2026-8463 is a medium-severity vulnerability in Leont Crypt\, classified under Buffer Over-read. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-8463?

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

Integer overflow in Leont Crypt\

CVE-2026-8463

Crypt::Argon2 versions from 0.017 before 0.031 for Perl perform a heap out-of-bounds read in argon2_verify on empty encoded input. The auto-detect form of argon2_verify passes encoded_len - 1 as the length argument to memchr without check…

EPSS: 0.000 (12.7th percentile) — read the EPSS interpretation.

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.

Affected products

Leont Crypt\ — versions \
Leont Crypt::argon2 — versions 0.017

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2026-8463?: CVE-2026-8463 is a medium-severity vulnerability in Leont Crypt\, classified under Buffer Over-read. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-8463?: Medium severity. CVSS v3 base score is 5.3 out of 10.