Buffer overflow in Squirrel
CVE-2026-8261
A vulnerability was determined in Squirrel up to 3.2. This affects the function SQFunctionProto::Load of the file squirrel/sqobject.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (10.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.001
Affected products
- Squirrel — versions 3.0, 3.1, 3.2
Weakness classification (CWE)
References
- github.com/albertodemichelis/squirrel/issues/326 (issue-tracking)
- github.com/biniamf/pocs/tree/main/squirrel-sqobject-functionproto-load-intovf-l… (exploit)
- vuldb.com/submit/809904 (third-party-advisory)
- vuldb.com/vuln/362558 (technical-description, vdb-entry)
- vuldb.com/vuln/362558/cti (signature, permissions-required)
Frequently asked questions
- What is CVE-2026-8261?
- CVE-2026-8261 is a medium-severity vulnerability in Squirrel, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.9/10. Published 2026-05-11.
- How severe is CVE-2026-8261?
- Medium severity. CVSS v3 base score is 5.9 out of 10.