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.

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 2026-11-08 · last modified 2026-11-08.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Go-Vikunja Vikunja

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

GitHub Security Advisory (GHSA-9hxw-pxcq-4q8q) (vendor-advisory)
VulnCheck Advisory: Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes (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.