Buffer overflow in Chaiscript
CVE-2026-2655
A vulnerability was detected in ChaiScript up to 6.1.0. The impacted element is the function chaiscript::str_less::operator of the file include/chaiscript/chaiscript_defines.hpp. The manipulation results in use after free. The attack requires a local approach. The attack requires a high level of complexity. The exploitability is regarded as difficult. The exploit is now public and may be used. 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 2.5 (Low). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (5.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.4% 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: -0.000
Affected products
- Chaiscript
- Chaiscript — versions 6.0, 6.1.0
Weakness classification (CWE)
References
- vuldb.com/ (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
- vuldb.com/ (signature, permissions-required, VDB Entry, Third Party Advisory)
- vuldb.com/ (VDB Entry, Third Party Advisory, third-party-advisory)
- github.com/ChaiScript/ChaiScript/issues/632 (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
- github.com/ChaiScript/ChaiScript/issues/632 (issue-tracking, Exploit, exploit, Issue Tracking, Vendor Advisory)
- github.com/ChaiScript/ChaiScript/ (Product, product)
Frequently asked questions
- What is CVE-2026-2655?
- CVE-2026-2655 is a low-severity vulnerability in Chaiscript, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 2.5/10. Published 2026-02-18.
- How severe is CVE-2026-2655?
- Low severity. CVSS v3 base score is 2.5 out of 10.