What is CVE-2026-91970?

CVE-2026-91970 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-15.

How severe is CVE-2026-91970?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Go-Vikunja Vikunja

CVE-2026-91970

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.

Published 2026-09-15 · last modified 2026-09-16.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.004 (31.8th percentile), scored 2026-10-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.001

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-wq92-8x3r-fm38 (vendor-advisory)
www.vulncheck.com/advisories/vikunja-before-2.6.0-resource-exhaustion-via-plank… (third-party-advisory)

Frequently asked questions

What is CVE-2026-91970?: CVE-2026-91970 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-09-15.
How severe is CVE-2026-91970?: Medium severity. CVSS v3 base score is 6.5 out of 10.