What is CVE-2026-100267?

CVE-2026-100267 is a medium-severity vulnerability in Jetbrains Youtrack, classified under Inefficient Regular Expression Complexity. CVSS score: 5.9/10. Published 2026-09-30.

How severe is CVE-2026-100267?

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

Vulnerability in Jetbrains Youtrack

CVE-2026-100267

In JetBrains YouTrack before 2026.2.19197 reDoS attack was possible via mailbox regex mail-rule filters

Vulnerability class: ReDoS (Regular Expression Denial of Service)

Published 2026-09-30 · last modified 2026-09-30.

CVSS v3 metric

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

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 Youtrack

Weakness classification (CWE)

CWE-1333 — Inefficient Regular Expression Complexity

References

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

Frequently asked questions

What is CVE-2026-100267?: CVE-2026-100267 is a medium-severity vulnerability in Jetbrains Youtrack, classified under Inefficient Regular Expression Complexity. CVSS score: 5.9/10. Published 2026-09-30.
How severe is CVE-2026-100267?: Medium severity. CVSS v3 base score is 5.9 out of 10.