Vulnerability · Published Nov 8, 2026 · Assigned by VulnCheck
CVE-2026-123511Vikunja before 2.7.1 Resource Exhaustion via CalDAV VTODO RELATED-TO Entries
Medium 4.3
In plain English
A medium-severity resource allocation without limits in vikunja from go-vikunja. There are no confirmed reports of exploitation so far.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)–no EPSS score yet
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | 0 – before 2.7.1 |
Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- GitHub Security Advisory (GHSA-c934-xjq2-mrg3) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.7.1 Resource Exhaustion via CalDAV VTODO RELATED-TO Entries third-party-advisory