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

EPSS: 0.002 (9.1th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

References

  • cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
  • cna@vuldb.com (signature, permissions-required, VDB Entry, Third Party Advisory)
  • cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
  • cna@vuldb.com (issue-tracking, Exploit, Issue Tracking, Vendor Advisory)
  • cna@vuldb.com (issue-tracking, Exploit, exploit, Issue Tracking, Vendor Advisory)
  • cna@vuldb.com (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.