CVE-2026-56316
MEDIUMCap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
Title source: cnaDescription
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.
References (2)
Core 2
Core References
Vendor Advisory vendor-advisory
GHSA Advisory GHSA-9c2x-7h5x-37gm
https://github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm
Third Party Advisory third-party-advisory
VulnCheck Advisory: Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
https://www.vulncheck.com/advisories/cap-go-job-existence-oracle-via-unauthenticated-options-build-upload-jobid
Scores
CVSS v3
5.3
EPSS
0.0024
EPSS Percentile
15.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-203
Status
published
Products (2)
Cap-go/capgo
< 12.128.2
Cap-go/capgo
12.128.2
Published
Jun 21, 2026
Tracked Since
Jun 21, 2026