CVE-2026-56316 Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
Unauthenticated attackers can enumerate valid job IDs and cause resource exhaustion via the Cap-go build upload endpoint.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56316?
CVE-2026-56316 is a medium-severity vulnerability in Cap-go capgo, published on 21 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Cap-go before 12.128.2 contains an information disclosure vulnerability in the OPTIONS /build/upload/:jobId/* endpoint that allows unauthenticated attackers to enumerate valid builder job IDs through observable response discrepancies. Attackers can probe the endpoint without authentication to distinguish valid job IDs from invalid ones and generate sustained unauthenticated traffic for resource consumption.
Weakness: CWE-203
Which versions are affected by CVE-2026-56316?
How do I fix CVE-2026-56316?
No fix has been published for CVE-2026-56316 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-56316 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56316 exists.
Sources
Also known as GHSA-844f-662p-whq4, GHSA-9c2x-7h5x-37gm.