Resource exhaustion in Capgo
CVE-2026-56255
Capgo before 12.128.2 contains a denial of service vulnerability in the POST /app/demo endpoint that allows authenticated users with org write permissions to create unlimited demo applications without rate limiting or quota enforcement. Attackers can repeatedly invoke this endpoint to generate approximately 138 database write operations per request, causing degraded performance, increased costs, and potential service instability.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (29.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Capgo — versions 0, 12.128.2
Weakness classification (CWE)
References
- github.com/Cap-go/capgo/security/advisories/GHSA-q2xx-6h9x-43fw (vendor-advisory)
- www.vulncheck.com/advisories/capgo-denial-of-service-via-unlimited-demo-app-cre… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-56255?
- CVE-2026-56255 is a medium-severity vulnerability in Capgo, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.3/10. Published 2026-06-22.
- How severe is CVE-2026-56255?
- Medium severity. CVSS v3 base score is 4.3 out of 10.