What is CVE-2026-8258?

CVE-2026-8258 is a medium-severity vulnerability in Squirrel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-05-11.

How severe is CVE-2026-8258?

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

Buffer overflow in Squirrel

CVE-2026-8258

A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The e…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (2.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

N/a Squirrel — versions 3.0, 3.1, 3.2

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, vdb-entry)
cna@vuldb.com (signature, permissions-required)
cna@vuldb.com (third-party-advisory)
cna@vuldb.com (issue-tracking)
cna@vuldb.com (exploit)

Frequently asked questions

What is CVE-2026-8258?: CVE-2026-8258 is a medium-severity vulnerability in Squirrel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.3/10. Published 2026-05-11.
How severe is CVE-2026-8258?: Medium severity. CVSS v3 base score is 5.3 out of 10.