CVE-2026-56316
Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
- State
- Published
- Severity
- 6.9 Medium
- Published
- Jun 21, 2026
- Updated
- Jun 24, 2026
- Reserved
- Jun 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | VulnCheck |
Weaknesses
- CWE-203 Observable Discrepancy
Affected Products
| Product | Versions |
|---|---|
capgoCap-go |
|
References
- GHSA Advisory GHSA-9c2x-7h5x-37gmvendor-advisory
- VulnCheck Advisory: Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*third-party-advisory
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