EUVD-2026-78650
GHSA-p4h8-xg7f-xqrc
Severity by source
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
Network-reachable import endpoint needs only a low-privileged account and no user interaction; impact is availability-only resource exhaustion.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
7DescriptionCVE.org
Vikunja before 2.6.0 fails to limit archive expansion during data import, allowing authenticated users to cause denial of service. Attackers can upload highly compressed files that expand to tens of gigabytes in memory and disk, exhausting server resources and crashing the instance.
AnalysisAI
Authenticated users of self-hosted Vikunja instances before 2.6.0 can crash the server by uploading a highly compressed archive through the data-import feature, which is expanded without any size or expansion-ratio limit and consumes tens of gigabytes of memory and disk. The issue is a classic decompression-bomb denial of service (CWE-400) rated 7.1 under CVSS 4.0 (AV:N/AC:L/PR:L/UI:N, availability-only impact); any account able to reach the import endpoint is sufficient, no administrative rights are needed. …
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Recommended ActionAI
Within 24 hours, identify all self-hosted Vikunja instances in the environment, confirm their running version, and restrict or disable access to the data-import endpoint for non-essential accounts until upgrades are complete; also review import-related logs for anomalous archive uploads. …
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Same weakness CWE-400 – Uncontrolled Resource Consumption
View allSame technique Denial Of Service
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External POC / Exploit Code
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