CVE-2026-91970 Vikunja before 2.6.0 Resource Exhaustion via Planka Migration
Authenticated attackers can cause denial of service in Vikunja by exploiting a resource exhaustion flaw in the Planka migration feature.
- 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-2026-91970?
CVE-2026-91970 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 Planka migrator that fails to enforce aggregate memory budgets during migration jobs. Authenticated attackers can submit migration requests pointing to attacker-controlled servers advertising numerous size-compliant attachments, exhausting worker memory and causing denial of service for all users.
Weakness: CWE-770
Which versions are affected by CVE-2026-91970?
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-2026-91970?
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-2026-91970 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91970 exists.
Sources
Also known as GHSA-wq92-8x3r-fm38, GO-2026-6757.