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Vulnerability record · CVE-2026-91971 · published 15 September 2026

CVE-2026-91971: Uncontrolled resource consumption vulnerability

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.

7.1 CVSS 4.0 High EPSS 0.44% · top 64.7% CWE-400 · Uncontrolled resource consumption Deferred
7.1CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
21 Sep 2026Last modified by NVD

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: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:

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-91971), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.