{"cve":"CVE-2026-91968","nvd":{"published":"2026-09-15T16:17:53.093","modified":"2026-09-16T20:16:09.343","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":7.1},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-674"],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr","https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-unbounded-filter-recursion","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-xxc3-xpmc-vmvr"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-91968","score":0.00436,"percentile":0.37865,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-xxc3-xpmc-vmvr","url":"https://osv.dev/vulnerability/GHSA-xxc3-xpmc-vmvr","summary":"Vikunja: Unbounded nested task-filter recursion permits API process termination","modified":"2026-10-19T21:40:57.352245323Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":[">=2.5.0 <2.6.0"],"fixed":["2.6.0"]}]},{"id":"GO-2026-6759","url":"https://osv.dev/vulnerability/GO-2026-6759","summary":"Vikunja: Unbounded nested task-filter recursion permits API process termination in code.vikunja.io/api","modified":"2026-10-19T21:31:38.312582011Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["all versions"],"fixed":[]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}