CVE-2026-91968

Medium

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.

SeverityMedium

CVSS6.5

Exploit probability—

ProductCode.vikunja.io/api

PublishedSep 15, 2026

First seenSep 15, 2026

Weakness typeCWE-674CWE-674

How to fix

Update

code.vikunja.io/api2.6.0 or later

Vendor advisories

github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr

Affected products

Product	Affected versions	Fixed in
code.vikunja.io/apiGo	2.5.0 ≤ v < 2.6.0, No range specified	2.6.0

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