Medium severity · published Jun 21, 2026
CVE-2026-56316
Cap-go - Job Existence Oracle via Unauthenticated OPTIONS /build/upload/:jobId/*
5.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
capgo · Cap-go
before 12.128.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56316
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56316
github.com
https://github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm
www.vulncheck.com
https://www.vulncheck.com/advisories/cap-go-job-existence-oracle-via-unauthenticated-options-build-upload-jobid
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