CVE-2026-56316

MEDIUM EPSS 15.2%

Published Jun 21, 20261w ago · Modified Jun 22, 20261w ago

6.9 CVSS 4.0

Medium

Published Jun 21, 2026 1w ago

Last Modified Jun 22, 2026 1w ago

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 Details

Base Score

6.9

Exploitability

—

Impact

—

Vector string

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

15.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-203

References 2

github.com https://github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm
vulncheck.com https://www.vulncheck.com/advisories/cap-go-job-existence-oracle-via-unauthenticated-options-build-upload-jobid

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.