CVE-2026-35599
Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler
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.
INFO
Published Date :
April 10, 2026, 5:17 p.m.
Last Modified :
April 17, 2026, 9:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Vikunja to version 2.3.0 or later.
- Apply vendor patches or updates promptly.
- Monitor system performance after updates.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-35599.
| URL | Resource |
|---|---|
| https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b | Patch |
| https://github.com/go-vikunja/vikunja/pull/2577 | Issue Tracking |
| https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 | Release Notes |
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-35599 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-35599
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-35599 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-35599 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 17, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:* versions up to (excluding) 2.3.0 Added Reference Type GitHub, Inc.: https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b Types: Patch Added Reference Type GitHub, Inc.: https://github.com/go-vikunja/vikunja/pull/2577 Types: Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Apr. 10, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-407 Added Reference https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b Added Reference https://github.com/go-vikunja/vikunja/pull/2577 Added Reference https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 Added Reference https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7