CVE Tools
Sign in

CVE-2026-35599

Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler

Published: Apr 10, 2026Updated: Apr 17, 2026 Sources: CVE List NVDCWE-407
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 73.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-407

Affected Products

vikunjavikunja
On-prem
Enterprise Software / collaboration-groupware
vikunjago-vikunja
On-prem
Cloud & SaaS / saas-application
vikunjaoss-projectEnterprise Software
go-vikunjaoss-projectCloud & SaaSaka vikunja

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b
github.com
https://github.com/go-vikunja/vikunja/pull/2577
github.com
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
github.com
and 1 more references View all →

Timeline

Published
Apr 10, 2026
Last Updated
Apr 17, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-35599 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows