CVE-2026-56316: Cap-Go Capgo

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Cap-Go Capgo: before 12.128.2 (fixed in 12.128.2)

Published 2026-06-21. Last modified 2026-06-24.