Resource exhaustion in Go-Vikunja Vikunja
CVE-2026-123501
Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated users to exhaust server memory through concurrent image decodes in avatar and background uploads. Attackers can send several parallel tiny, highly compressible PNGs decoded at up to 50 megapixels each, pushing the API process into memory pressure or an OOM kill.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.003 (23.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 24th percentile — 23.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-9hxw-pxcq-4q8q (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-before-2.7.1-memory-exhaustion-dos-via-unb… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123501?
- CVE-2026-123501 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-11-08.
- How severe is CVE-2026-123501?
- Medium severity. CVSS v3 base score is 6.5 out of 10.