API process termination via unbounded filter recursion
Published Sep 15, 2026 · Updated Sep 15, 2026
Resource exhaustion in Vikunja before 2.6.0 allows remote authenticated users to terminate the API process through task filters. The task-filter endpoint recursively processes each nested parenthesized filter expression without enforcing a depth limit, so a crafted query can exhaust process memory. A valid account and network access to the endpoint are required; successful exploitation crashes the API and interrupts task-management service.
Summary
What happened
Resource exhaustion in Vikunja before 2.6.0 allows remote authenticated users to terminate the API process through task filters. The task-filter endpoint recursively processes each nested parenthesized filter expression without enforcing a depth limit, so a crafted query can exhaust process memory. A valid account and network access to the endpoint are required; successful exploitation crashes the API and interrupts task-management service.
The record
- CVE
- CVE-2026-91968
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Vendor
- Vikunja
- Product
- Vikunja
- Classifications
- T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 15, 2026CVE publishedPublication date reported by the CVE source.
- Sep 15, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.5.0 <2.6.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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