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CVE-2026-91968— vikunja before 2.6.0 Denial of Service via unbounded filter recursion

Quick assessment

Affected
go-vikunja vikunja
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vikunja 2.6.0 之前的版本存在一个资源耗尽漏洞，位于任务筛选端点中。该端点接受深度嵌套的筛选表达式，但未设置递归深度限制。经过身份验证的攻击者可以在筛选查询参数中提供数千个嵌套的括号，从而耗尽内存并导致 API 进程终止。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 2 AI

T1499 · Endpoint Denial of Service T1298
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I. Basic Information for CVE-2026-91968

Vulnerability Information
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Vulnerability Title
vikunja before 2.6.0 Denial of Service via unbounded filter recursion
Source: CVE Program / CVE List V5
Vulnerability Description
vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja 2.5.0 ~ 2.6.0 -

II. Public POCs for CVE-2026-91968

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III. Intelligence Information for CVE-2026-91968

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Vendor Advisories for CVE-2026-91968 (2)

Same Patch Batch · go-vikunja · 2026-09-15 · 13 CVEs total

CVE-2026-91972 7.5 HIGH Vikunja before 2.6.0 Authentication Bypass via Unthrottled API
CVE-2026-91985 7.5 HIGH Vikunja before 2.6.0 Privilege Escalation via Link Share Hash
CVE-2026-91973 7.5 HIGH Vikunja before 2.6.0 Authentication Bypass via CalDAV BasicAuth
CVE-2026-91971 6.5 MEDIUM Vikunja before 2.6.0 Denial of Service via Avatar Upload
CVE-2026-91979 6.5 MEDIUM Vikunja before 2.6.0 Denial of Service via Decompression Bomb
CVE-2026-91970 6.5 MEDIUM Vikunja before 2.6.0 Resource Exhaustion via Planka Migration
CVE-2026-91969 6.5 MEDIUM vikunja before 2.6.0 Resource Exhaustion via CSV Migration
CVE-2026-91982 4.3 MEDIUM Vikunja before 2.6.0 TOTP Secret Disclosure via API
CVE-2026-91980 4.3 MEDIUM vikunja before 2.6.0 Team Enumeration via Project Share
CVE-2026-91981 4.3 MEDIUM Vikunja before 2.6.0 User Enumeration via v2 API
CVE-2026-91983 4.3 MEDIUM Vikunja before 2.6.0 API Token Scope Bypass via expand Parameter
CVE-2026-91984 4.3 MEDIUM Vikunja before 2.6.0 Broken Object-Level Authorization via task-position

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-674

V. Comments for CVE-2026-91968

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