Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91970Vikunja before 2.6.0 Resource Exhaustion via Planka Migration

Medium 6.5

In plain English

A medium-severity resource allocation without limits in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 68.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.6.0	GHSA-wq92-8x3r-fm38
Go	code.vikunja.io/api	no fix listed	GO-2026-6757

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	0 – before 2.6.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-wq92-8x3r-fm38) vendor-advisory
VulnCheck Advisory: Vikunja before 2.6.0 Resource Exhaustion via Planka Migration third-party-advisory