CVE-2026-91968

MEDIUM 6.5

vikunja before 2.6.0 Denial of Service via unbounded filter recursion

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-674
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026
Last Updated	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

go-vikunja / vikunja

2.5.0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-unbounded-filter-recursion

Credits

🔍 Zyy0530 🔍 Str1ckl4nd 🔍 7thParkk