CVE-2026-56316

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductCap-go Capgo

PublishedJun 21, 2026

First seenJun 21, 2026

Weakness typeCWE-203CWE-203

How to fix

Update

Cap-go capgo12.128.2 or later

Vendor advisories

github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm

Affected products

Product	Affected versions	Fixed in
Cap-go capgo	v < 12.128.2	12.128.2

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