CVE-2026-91968: Uncontrolled Recursion in go-vikunja vikunja
vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.
AI Analysis
Technical Summary
vikunja before version 2.6.0 contains a resource exhaustion vulnerability in the task-filter endpoint due to uncontrolled recursion depth in filter expressions. Authenticated users can craft filter queries with excessive nested parentheses, leading to memory exhaustion and crashing the API process. This vulnerability affects versions >=2.5.0 and <2.6.0. The CVSS 3.1 base score is 6.5, indicating a medium severity with network attack vector, low attack complexity, and requiring privileges but no user interaction. The impact is denial of service via API process termination.
Potential Impact
An authenticated attacker can cause a denial of service by exhausting server memory through deeply nested filter expressions in the task-filter endpoint. This results in termination of the API process, disrupting service availability. There is no impact on confidentiality or integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the task-filter endpoint to trusted users and monitor for abnormal query patterns that may indicate exploitation attempts.
CVE-2026-91968: Uncontrolled Recursion in go-vikunja vikunja
Description
vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.
CVSS v3.1
Score 6.5medium
Affected software
go-vikunja
vikunja
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
vikunja before version 2.6.0 contains a resource exhaustion vulnerability in the task-filter endpoint due to uncontrolled recursion depth in filter expressions. Authenticated users can craft filter queries with excessive nested parentheses, leading to memory exhaustion and crashing the API process. This vulnerability affects versions >=2.5.0 and <2.6.0. The CVSS 3.1 base score is 6.5, indicating a medium severity with network attack vector, low attack complexity, and requiring privileges but no user interaction. The impact is denial of service via API process termination.
Potential Impact
An authenticated attacker can cause a denial of service by exhausting server memory through deeply nested filter expressions in the task-filter endpoint. This results in termination of the API process, disrupting service availability. There is no impact on confidentiality or integrity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the task-filter endpoint to trusted users and monitor for abnormal query patterns that may indicate exploitation attempts.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-15T11:08:44.670Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa9651c55bf5e2cf502eb21
Added to database: 09/15/2026, 15:32:44 UTC
Last enriched: 09/15/2026, 15:47:48 UTC
Last updated: 09/16/2026, 02:32:25 UTC
Views: 7
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