CVE-2026-100267: JetBrains Youtrack

Medium severity, CVSS 5.9. EPSS: 0.3% chance of exploitation in the next 30 days.

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

Affected products

• JetBrains Youtrack: before 2026.2.19197 (fixed in 2026.2.19197)

Published 2026-09-30. Last modified 2026-10-01.