CVE-2026-100267 Denial of service in YouTrack

What is CVE-2026-100267?

CVE-2026-100267 is a medium-severity denial of service vulnerability in Jetbrains Youtrack, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-1333

Which versions are affected by CVE-2026-100267?

It affects 1 product.

Products include Jetbrains Youtrack.

How do I fix CVE-2026-100267?

No fix has been published for CVE-2026-100267 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-100267 being exploited?

There is no known exploitation of CVE-2026-100267 in the wild and no public exploit code.

Other vulnerabilities in Jetbrains Youtrack

• CVE-2026-62422 Auth bypass in YouTrack Critical 10.0
• CVE-2022-24442 Code injection in n/a Critical 9.8
• CVE-2021-43185 Other in n/a Critical 9.8
• CVE-2021-25770 Code injection in n/a Critical 9.8
• CVE-2019-12850 SQL injection in n/a Critical 9.8

All Jetbrains Youtrack vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-h6p5-g44x-3r85.