EUVD-2026-78644
GHSA-jfw3-2gcf-23r5
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 API but exploitation needs a valid authenticated account and a crafted filter, so PR:L; only availability is impacted.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
7DescriptionCVE.org
vikunja versions before 2.6.0 contain a resource exhaustion vulnerability in the task-filter endpoint that accepts deeply nested filter expressions without recursion depth limits. Authenticated attackers can supply thousands of nested parentheses in the filter query parameter to exhaust memory and terminate the API process.
AnalysisAI
Memory exhaustion in the Vikunja task-filter endpoint lets any authenticated user crash the API service by submitting a filter query containing thousands of nested parentheses, which the recursive expression parser consumes without a depth limit. All deployments before version 2.6.0 are affected (EUVD lists 2.5.0 through 2.5.x), and a single low-privileged account is enough to repeatedly take the backend offline. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated Vikunja account or API token (PR:L in the CVSS vector) - anonymous users cannot reach the vulnerable code path - plus network reachability to the REST API, and the attacker must be able to supply a `filter` query parameter to the task-filter endpoint carrying thousands of nested parentheses. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VA:H/SC:N/SI:N/SA:N, base 7.1) is internally consistent with the description: remote, low-complexity, no user interaction, and requiring only a low-privileged authenticated account, with availability impact confined to the vulnerable system and no confidentiality or integrity effect. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade Vikunja to 2.6.0 or later, which introduces the recursion-depth handling for the filter parser and is the only complete fix; the fix is announced in the GitHub security advisory at https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-674 – Uncontrolled Recursion
View allSame technique Denial Of Service
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External POC / Exploit Code
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