CVE-2026-123511 Vikunja before 2.7.1 Resource Exhaustion via CalDAV VTODO RELATED-TO Entries
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123511?
CVE-2026-123511 is a medium-severity vulnerability in go-vikunja vikunja, published on 8 Nov 2026.
Official description
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-123511?
How do I fix CVE-2026-123511?
No fix has been published for CVE-2026-123511 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123511 being exploited?
There is no known exploitation of CVE-2026-123511 in the wild and no public exploit code.
Sources
Also known as GHSA-c934-xjq2-mrg3, GHSA-fvq6-3pq9-7pfq.