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Advisory record · GHSA-xxc3-xpmc-vmvr

Vikunja: Unbounded nested task-filter recursion permits API process termination

CVSS 7.1 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 9 Oct 2026, 20:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
code.vikunja.io/apiGo>=2.5.0, <2.6.02.6.0
Identifiers
GHSA-xxc3-xpmc-vmvr · CVE-2026-91968 · GO-2026-6759
Weakness (CWE)
CWE-674
Tags
Published
9 Oct 2026
Updated
19 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vikunja (code.vikunja.io/api) versions 2.5.0 up to but not including 2.6.0 are vulnerable. A low-privileged authenticated user can send a task-list request with a filter expression nested thousands of levels deep, which makes the server parse it recursively until memory is exhausted and the API process is killed, denying service to all users. Upgrade to version 2.6.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.1 High 4.0 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 (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0044, the 38th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:11 UTC First seen by agentprime
  2. 31 Oct 2026, 14:11 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.