{"id":"CVE-2026-91971","revision":"de1e75aac5744f038228639603249d4e","records":[{"revision":"de1e75aac5744f038228639603249d4e","observedAt":"2026-10-25T16:19:22.228+00:00","statement":{"source":"nvd","id":"CVE-2026-91971","aliases":[],"title":"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 e…","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.","state":0,"publishedAt":"2026-09-15T16:17:53.947+00:00","modifiedAt":"2026-09-21T19:17:16.073+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · disclosure@vulncheck.com · Secondary","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/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","score":7.1,"severity":"HIGH"},{"system":"CVSS 3.1 · disclosure@vulncheck.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91971","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-400"],"productCriteria":[],"sourceDates":{"published":"2026-09-15T16:17:53.947","lastModified":"2026-09-21T19:17:16.073"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-91971","identifiers":["CVE-2026-91971"]},"retained":false,"historicalAffected":[]}],"coverage":[]}