What is CVE-2026-123835?

CVE-2026-123835 is a medium-severity vulnerability in Jetbrains Datalore, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 5.9/10. Published 2026-11-06.

How severe is CVE-2026-123835?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Jetbrains Datalore

CVE-2026-123835

In JetBrains Datalore before 2026.4 code execution was possible in another user's computation via an init script upload race condition

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

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

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jetbrains Datalore

Weakness classification (CWE)

CWE-367 — Time-of-check Time-of-use (TOCTOU) Race Condition

References

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

Frequently asked questions

What is CVE-2026-123835?: CVE-2026-123835 is a medium-severity vulnerability in Jetbrains Datalore, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 5.9/10. Published 2026-11-06.
How severe is CVE-2026-123835?: Medium severity. CVSS v3 base score is 5.9 out of 10.