TI-2026-02267 Aliases CVE-2026-2655 GHSA-6qr6-c44j-c793

ChaiScript chaiscript_defines.hpp operator use after free

MEDIUM 44CWE-119Published 2026-02-18 · Updated 2026-02-23

Key facts

Attack vector: Local
Privileges required: Low
User interaction: None
Attack complexity: High
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · None · Low
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00215 12th percentileScored 2026-11-07

Public exploit Yes 2 exploit referencesTagged by NVD and the CNA

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	ChaiScript	6.0; 6.1.0	—	No fix listed	CNA

ChaiScript Vendor— Affected 6.0; 6.1.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:chaiscript:chaiscript::::::::	up to 6.1.0	Vulnerable	Chaiscript

cpe:2.3:a:chaiscript:chaiscript:*:*:*:*:*:*:*:* Versions up to 6.1.0 Vulnerable ·Chaiscript

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-2655
2026-10-03 Alias added: GHSA-6qr6-c44j-c793

References

Exploit 2

Other 1

https://github.com/ChaiScript/ChaiScript/

TI-2026-02920 ChaiScript chaiscript_eval.hpp Function_Push_Pop recursion CVSS 4.0MEDIUM 4.8
TI-2026-02919 ChaiScript boxed_number.hpp go divide by zero CVSS 4.0MEDIUM 4.8
TI-2026-02918 ChaiScript boxed_number.hpp get_as memory corruption CVSS 4.0MEDIUM 4.8
TI-2026-02268 ChaiScript type_info.hpp bare_equal use after free CVSS 4.0LOW 2.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences