CVE-2026-56316
Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
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.
INFO
Published Date :
June 21, 2026, 1:26 p.m.
Last Modified :
June 21, 2026, 1:26 p.m.
Remotely Exploit :
Yes !
Source :
VulnCheck
Affected Products
The following products are affected by CVE-2026-56316
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 |
Solution
- Update Cap-go to version 12.128.2 or later.
- Restrict access to the /build/upload/:jobId/* endpoint.
- Implement rate limiting for the endpoint.
- Monitor traffic for suspicious enumeration attempts.
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CVE-2026-56316 vulnerability anywhere in the article.