Vikunja before 2.6.0 Resource Exhaustion via Planka Migration

published 2026-09-15 54 d ago modified 2026-10-19 20 d ago also GHSA-wq92-8x3r-fm38 , GO-2026-6757 , EUVD-2026-78646

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 links 2

go code.vikunja.io/api 2.6.0
go-vikunja vikunja 2.6.0

github.com/go-vikunja/vikunja#3688 pull request
github.com/go-vikunja/vikunja/releases/tag/v2.6.0 release

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 54 d ago (2026-09-15)

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/go-vikunja/vikunja/security/advisories/GHSA-wq92-8x3r-fm38 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA	4.0	7.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA	4.0	7.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem	package	affected	fixed in
go	code.vikunja.io/api	>=2.5.0, <2.6.0 all versions	2.6.0

Affected products

go-vikunja vikunja

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling

References

github.com /go-vikunja/vikunja/pull/3688
web
github.com /go-vikunja/vikunja/security/advisories/GHSA-wq92-8x3r-fm38
vendor-advisory, exploit, web, advisory
vulncheck.com /advisories/vikunja-before-2.6.0-resource-exhaustion-via-planka-migration
third-party-advisory, web
nvd.nist.gov /vuln/detail/CVE-2026-91970
advisory
github.com /go-vikunja/vikunja
package
github.com /go-vikunja/vikunja/releases/tag/v2.6.0
web

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary