Vulnerability in Go-Vikunja Vikunja
CVE-2026-91968
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (37.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-unbound… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91968?
- CVE-2026-91968 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Uncontrolled Recursion. CVSS score: 6.5/10. Published 2026-09-15.
- How severe is CVE-2026-91968?
- Medium severity. CVSS v3 base score is 6.5 out of 10.