medium6.5
CVE-2026-35599
Vikunja has Algorithmic Complexity DoS in Repeating Task Handler
Impact
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the addRepeatIntervalToTime function uses an O(n) loop that advances a date by the task's RepeatAfter duration until it exceeds the current time. By creating a repeating task with a 1-second interval and a due date far in the past, an attacker triggers billions of loop iterations, consuming CPU and holding a database connection for minutes per request. This vulnerability is fixed in 2.3.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <= 2.2.2 | 2.3.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Vikunja | Vikunja | before 2.3.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b
- https://github.com/go-vikunja/vikunja/pull/2577
- https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7
- https://github.com/advisories/GHSA-r4fg-73rc-hhh7
- https://nvd.nist.gov/vuln/detail/CVE-2026-35599