What is CVE-2026-123511?

CVE-2026-123511 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-11-08.

How severe is CVE-2026-123511?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Resource exhaustion in Go-Vikunja Vikunja

CVE-2026-123511

Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated CalDAV clients to create unbounded dummy tasks by sending VTODOs with thousands of RELATED-TO properties. Attackers can repeat unknown related UIDs in a single PUT request to generate thousands of task, relation, and event rows, bloating the database and overloading the event pipeline.

Published 2026-11-08 · last modified 2026-11-08.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Go-Vikunja Vikunja

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

github.com/go-vikunja/vikunja/security/advisories/GHSA-c934-xjq2-mrg3 (vendor-advisory)
www.vulncheck.com/advisories/vikunja-before-2.7.1-resource-exhaustion-via-calda… (third-party-advisory)

Frequently asked questions

What is CVE-2026-123511?: CVE-2026-123511 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-11-08.
How severe is CVE-2026-123511?: Medium severity. CVSS v3 base score is 4.3 out of 10.