What is CVE-2026-12166?

CVE-2026-12166 is a medium-severity vulnerability in Little Orbit Gamefirst Anti-cheat, classified under CWE-476 NULL POINTER DEREFERENCE. CVSS score: 5.5/10. Published 2026-07-02.

How severe is CVE-2026-12166?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2026-12166 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Little Orbit Gamefirst Anti-cheat

CVE-2026-12166

A NULL pointer dereference vulnerability for driver `GFAC_Sys_x64.sys` in Little Orbit GFAC allows a local attacker to cause a denial of service via crafted requests that trigger a system crash.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Little Orbit Gamefirst Anti-cheat — versions 0

Public proof-of-concept exploits

FzRsLLaSheR/CVE-2026-12166_CVE-2026-12167_CVE-2026-12168

References

Frequently asked questions

What is CVE-2026-12166?: CVE-2026-12166 is a medium-severity vulnerability in Little Orbit Gamefirst Anti-cheat, classified under CWE-476 NULL POINTER DEREFERENCE. CVSS score: 5.5/10. Published 2026-07-02.
How severe is CVE-2026-12166?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2026-12166 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.