CVE-2026-91969 vikunja before 2.6.0 Resource Exhaustion via CSV Migration
Authenticated attackers can cause denial of service by uploading large CSV files to exhaust memory in Vikunja task manager.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-91969?
CVE-2026-91969 is a high-severity denial of service vulnerability in go-vikunja vikunja, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the POST /api/v2/migration/csv/migrate endpoint that fails to limit parsed row cardinality. Authenticated attackers can upload multipart CSV files with millions of tiny records to exhaust process memory and terminate the API service.
Weakness: CWE-400
Which versions are affected by CVE-2026-91969?
3 open source packages ship an affected version, including code.vikunja.io/api.
| Package | Affected | Fixed in |
|---|---|---|
code.vikunja.io/api Go | All versions | None |
code.vikunja.io/api Go | From 2.5.0 | 2.6.0 |
code.vikunja.io/api Go | From 2.5.0 | 2.6.0 |
How do I fix CVE-2026-91969?
Upgrade code.vikunja.io/api to 2.6.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-91969 being exploited?
There is no known exploitation of CVE-2026-91969 in the wild and no public exploit code.
Sources
Also known as GHSA-pqf9-h8g4-8gmh, GO-2026-6746.