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Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-35599Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler

Medium 6.5

In plain English

A medium-severity security flaw in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 71.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official description

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 & fixed versions

EcosystemPackageFixed inAdvisory
Gocode.vikunja.io/api2.3.0GHSA-r4fg-73rc-hhh7
Gocode.vikunja.io/apino fix listedGO-2026-5608

Affected products (as reported)

VendorProductVersions
go-vikunja vikunja < 2.3.0

Weakness: CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References