Medium severity · published Sep 15, 2026
CVE-2026-91970
Vikunja before 2.6.0 Resource Exhaustion via Planka Migration
6.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
before 2.6.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91970
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91970
github.com
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wq92-8x3r-fm38
www.vulncheck.com
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-resource-exhaustion-via-planka-migration
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