CVE-2026-35599

Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler

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

go-vikunja · vikunja

CVSS v3.1 GITHUB

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS

0.58% chance of exploitation in the next 30 days, 47th percentile

Published

2026-04-10

Proof-of-concept exploits (1)

• advisories/GHSA-r4fg-73rc-hhh7

Security advisories

• go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7
• go-vikunja/vikunja/pull/2577

References

• CVE Record
• NVD entry