CVE-2026-35599: CWE-407: Inefficient Algorithmic Complexity in go-vikunja vikunja
Vikunja versions prior to 2. 3. 0 contain an inefficient algorithmic complexity vulnerability in the addRepeatIntervalToTime function. This function uses a loop that advances a date by the task's RepeatAfter interval until it exceeds the current time. An attacker can exploit this by creating a repeating task with a 1-second interval and a due date far in the past, causing billions of loop iterations. This results in high CPU consumption and prolonged database connection usage per request. The vulnerability is fixed in version 2. 3. 0.
AI Analysis
Technical Summary
The vulnerability in go-vikunja's vikunja product (CVE-2026-35599) is due to inefficient algorithmic complexity (CWE-407) in the addRepeatIntervalToTime function. The function iterates in an O(n) loop, incrementing a date by the RepeatAfter interval until it surpasses the current time. When exploited by setting a 1-second repeat interval with a due date far in the past, this causes excessive loop iterations, leading to significant CPU resource consumption and holding database connections for extended periods. This can degrade service availability. The issue is resolved in version 2.3.0.
Potential Impact
The vulnerability causes high CPU usage and prolonged database connection occupancy, potentially leading to denial of service conditions by exhausting server resources. There is no impact on confidentiality or integrity. The CVSS score is 6.5 (medium severity) reflecting the availability impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to vikunja version 2.3.0 or later, where this vulnerability is fixed. Since no official patch link or advisory is provided, users should verify the version upgrade from the vendor's official sources. Patch status is not explicitly confirmed beyond the version fix note, so check vendor advisories for current remediation guidance.
CVE-2026-35599: CWE-407: Inefficient Algorithmic Complexity in go-vikunja vikunja
Description
Vikunja versions prior to 2. 3. 0 contain an inefficient algorithmic complexity vulnerability in the addRepeatIntervalToTime function. This function uses a loop that advances a date by the task's RepeatAfter interval until it exceeds the current time. An attacker can exploit this by creating a repeating task with a 1-second interval and a due date far in the past, causing billions of loop iterations. This results in high CPU consumption and prolonged database connection usage per request. The vulnerability is fixed in version 2. 3. 0.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in go-vikunja's vikunja product (CVE-2026-35599) is due to inefficient algorithmic complexity (CWE-407) in the addRepeatIntervalToTime function. The function iterates in an O(n) loop, incrementing a date by the RepeatAfter interval until it surpasses the current time. When exploited by setting a 1-second repeat interval with a due date far in the past, this causes excessive loop iterations, leading to significant CPU resource consumption and holding database connections for extended periods. This can degrade service availability. The issue is resolved in version 2.3.0.
Potential Impact
The vulnerability causes high CPU usage and prolonged database connection occupancy, potentially leading to denial of service conditions by exhausting server resources. There is no impact on confidentiality or integrity. The CVSS score is 6.5 (medium severity) reflecting the availability impact. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade to vikunja version 2.3.0 or later, where this vulnerability is fixed. Since no official patch link or advisory is provided, users should verify the version upgrade from the vendor's official sources. Patch status is not explicitly confirmed beyond the version fix note, so check vendor advisories for current remediation guidance.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-03T21:25:12.162Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d943121cc7ad14dadcb1b3
Added to database: 4/10/2026, 6:36:02 PM
Last enriched: 4/10/2026, 6:51:22 PM
Last updated: 4/10/2026, 9:14:42 PM
Views: 4
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