ReDoS Vulnerability in JetBrains YouTrack Mailbox Regex Filters
CVE-2026-100267

5.9MEDIUM

Key Information:

Vendor

Jetbrains
Status
Youtrack
Vendor
CVE Published:
30 September 2026

What is CVE-2026-100267?

A ReDoS vulnerability exists in JetBrains YouTrack before version 2026.2.19197, allowing attackers to exploit mailbox regex filters through deliberate patterns. This could potentially lead to service disruptions as the application may experience excessive delays while processing certain regex rules in mail-rule filters. Users should upgrade to the latest version to mitigate this risk.

Affected Version(s)

YouTrack 0 < 2026.2.19197

References

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

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.