What is CVE-2026-123276?

CVE-2026-123276 is a high-severity vulnerability in Jetbrains Clion, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.8/10. Published 2026-11-06.

How severe is CVE-2026-123276?

High severity. CVSS v3 base score is 7.8 out of 10.

Vulnerability in Jetbrains Clion

CVE-2026-123276

In JetBrains CLion before 2026.3, 2026.2.4.1 code execution was possible in Safe Mode via a crafted GDB server debug profile

Published 2026-11-06 · last modified 2026-11-07.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (8.7th percentile), scored 2026-11-09.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Jetbrains Clion

Weakness classification (CWE)

CWE-829 — Inclusion of Functionality from Untrusted Control Sphere

References

www.jetbrains.com/privacy-security/issues-fixed/

Frequently asked questions

What is CVE-2026-123276?: CVE-2026-123276 is a high-severity vulnerability in Jetbrains Clion, classified under Inclusion of Functionality from Untrusted Control Sphere. CVSS score: 7.8/10. Published 2026-11-06.
How severe is CVE-2026-123276?: High severity. CVSS v3 base score is 7.8 out of 10.