{"cve":"CVE-2026-91971","nvd":{"published":"2026-09-15T16:17:53.947","modified":"2026-09-21T19:17:16.073","status":"Deferred","description":"Vikunja before 2.6.0 fails to apply pixel decode limits to avatar and project-background upload endpoints, allowing authenticated users to upload crafted images that decode to excessive pixel counts. Attackers can upload small images with extreme aspect ratios that consume significant CPU and memory during processing, causing denial of service through repeated or concurrent uploads.","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-400"],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j","https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-avatar-upload","https://github.com/go-vikunja/vikunja/security/advisories/GHSA-4vh2-39rq-rq8j"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:53:43.293028046+00:00"},"epss":{"cve":"CVE-2026-91971","score":0.00436,"percentile":0.37865,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-4vh2-39rq-rq8j","url":"https://osv.dev/vulnerability/GHSA-4vh2-39rq-rq8j","summary":"Vikunja: Unbounded image decode on avatar and project-background uploads enables decode/resize amplification","modified":"2026-10-19T21:41:15.904955453Z","packages":[{"ecosystem":"Go","name":"code.vikunja.io/api","purl":"pkg:golang/code.vikunja.io/api","ranges":["<2.6.0"],"fixed":["2.6.0"]}]},{"id":"GO-2026-6717","url":"https://osv.dev/vulnerability/GO-2026-6717","summary":"Vikunja: Unbounded image decode on avatar and project-background uploads enables decode/resize amplification in code.vikunja.io/api","modified":"2026-10-19T21:31:52.828092917Z","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."]}