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

CVSS 6.5 · Medium EPSS 0.04% · P14
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I. Basic Information for CVE-2026-35599

Vulnerability Information
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Vulnerability Title
Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
算法复杂性
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vikunja 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 2.3.0之前版本存在安全漏洞，该漏洞源于addRepeatIntervalToTime函数使用O(n)循环处理重复任务，可能导致通过创建特定重复任务触发数十亿次循环迭代，消耗CPU并长时间占用数据库连接。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
go-vikunjavikunja < 2.3.0 -

II. Public POCs for CVE-2026-35599

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III. Intelligence Information for CVE-2026-35599

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Same Patch Batch · go-vikunja · 2026-04-10 · 11 CVEs total

CVE-2026-355958.3 HIGHVikunja Affected by Privilege Escalation via Project Reparenting
CVE-2026-347277.4 HIGHVikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path
CVE-2026-355946.5 MEDIUMVikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission
CVE-2026-355975.9 MEDIUMVikunja Affected by TOTP Brute-Force Due to Non-Functional Account Lockout
CVE-2026-356005.4 MEDIUMVikunja has HTML Injection via Task Titles in Overdue Email Notifications
CVE-2026-356025.4 MEDIUMVikunja has a File Size Limit Bypass via Vikunja Import
CVE-2026-355964.3 MEDIUMVikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug
CVE-2026-355984.3 MEDIUMVikunja has Missing Authorization on CalDAV Task Read
CVE-2026-401034.3 MEDIUMVikunja's Scoped API tokens with projects.background permission can delete project backgro
CVE-2026-356014.1 MEDIUMVikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-407

V. Comments for CVE-2026-35599

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