EUVD-2026-38172
GHSA-844f-662p-whq4
Severity by source
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
Network-accessible unauthenticated OPTIONS endpoint leaks job IDs (C:L); no integrity or availability impact warrants N scoring for both.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
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
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Unauthenticated job ID enumeration in Cap-go (Capgo) before version 12.128.2 exposes internal builder job identifiers via observable response discrepancies on the OPTIONS /build/upload/:jobId/* endpoint. Any network-accessible attacker can probe this endpoint without credentials to distinguish valid job IDs from invalid ones, effectively building a map of active build jobs. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions are required beyond network access to the Capgo instance - the vulnerable OPTIONS endpoint is exposed by default on all pre-12.128.2 installations and requires no authentication (PR:N per CVSS 4.0 vector). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 6.9 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N) reflects moderate real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker iterates through candidate job ID values by sending OPTIONS requests to /build/upload/{jobId}/ against an internet-exposed Capgo instance, observing response status codes or headers to distinguish valid from invalid IDs. Within minutes of automated probing, the attacker compiles a list of active builder job IDs that can be used to target subsequent authenticated operations or monitor build pipeline activity for sensitive timing information. … |
| Remediation | Upgrade Capgo to version 12.128.2 or later, which contains the vendor-released patch per the GitHub Security Advisory GHSA-9c2x-7h5x-37gm (https://github.com/Cap-go/capgo/security/advisories/GHSA-9c2x-7h5x-37gm). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-203 – Observable Discrepancy
View allSame technique Information Disclosure
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External POC / Exploit Code
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