CVE-2026-100267: CWE-1333 in JetBrains YouTrack
A Regular Expression Denial of Service (ReDoS) vulnerability exists in JetBrains YouTrack versions before 2026.2.19197. The issue arises from mailbox regex mail-rule filters that can be exploited to cause denial of service. This vulnerability has a medium severity rating with a CVSS score of 5.9 and affects availability only, without impacting confidentiality or integrity.
AI Analysis
Technical Summary
CVE-2026-100267 is a ReDoS vulnerability in JetBrains YouTrack prior to version 2026.2.19197. The vulnerability is due to inefficient regular expression handling in mailbox regex mail-rule filters, which can be exploited to cause a denial of service condition by consuming excessive processing resources. The CVSS 3.1 base score is 5.9, reflecting a network attack vector with high attack complexity and no privileges or user interaction required. The vulnerability impacts availability but does not affect confidentiality or integrity.
Potential Impact
Exploitation of this vulnerability can lead to denial of service by causing the application to become unresponsive or slow due to excessive resource consumption when processing specially crafted mailbox regex mail-rule filters. There is no impact on data confidentiality or integrity.
Mitigation Recommendations
No official patch or remediation details are provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting exposure of the affected functionality and monitoring for abnormal resource usage related to mailbox regex mail-rule filters.
CVE-2026-100267: CWE-1333 in JetBrains YouTrack
Description
A Regular Expression Denial of Service (ReDoS) vulnerability exists in JetBrains YouTrack versions before 2026.2.19197. The issue arises from mailbox regex mail-rule filters that can be exploited to cause denial of service. This vulnerability has a medium severity rating with a CVSS score of 5.9 and affects availability only, without impacting confidentiality or integrity.
CVSS v3.1
Score 5.9medium
Affected software
JetBrains
YouTrack
pkg:maven/com.jetbrains/youtrackRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-100267 is a ReDoS vulnerability in JetBrains YouTrack prior to version 2026.2.19197. The vulnerability is due to inefficient regular expression handling in mailbox regex mail-rule filters, which can be exploited to cause a denial of service condition by consuming excessive processing resources. The CVSS 3.1 base score is 5.9, reflecting a network attack vector with high attack complexity and no privileges or user interaction required. The vulnerability impacts availability but does not affect confidentiality or integrity.
Potential Impact
Exploitation of this vulnerability can lead to denial of service by causing the application to become unresponsive or slow due to excessive resource consumption when processing specially crafted mailbox regex mail-rule filters. There is no impact on data confidentiality or integrity.
Mitigation Recommendations
No official patch or remediation details are provided in the available data. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting exposure of the affected functionality and monitoring for abnormal resource usage related to mailbox regex mail-rule filters.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- JetBrains
- Date Reserved
- 2026-09-25T17:02:07.268Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abd2c322a4e24523d2ec308
Added to database: 09/30/2026, 15:35:14 UTC
Last enriched: 09/30/2026, 15:50:53 UTC
Last updated: 10/01/2026, 03:42:44 UTC
Views: 13
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.