EUVD-2026-38368Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/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
Remote, low-complexity, requires a low-privilege read-only API key (PR:L), no UI; high availability impact from build cancellation, limited integrity, no confidentiality loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/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 a privilege inversion vulnerability in GET /build/logs/:jobId that allows read-only API key holders to cancel running native builds. The endpoint registers an abort listener on the SSE stream that unconditionally invokes cancelBuildOnDisconnect() using the privileged server-side BUILDER_API_KEY when clients disconnect, bypassing the app.build_native permission check required by the explicit POST /build/cancel/:jobId endpoint. Attackers with read-only API keys can repeatedly disrupt native build operations and CI/CD workflows by opening the log stream and dropping the connection.
AnalysisAI
Privilege inversion in Cap-go (Capgo) before 12.128.2 lets holders of read-only API keys cancel running native builds by abusing the GET /build/logs/:jobId SSE endpoint. On client disconnect the server invokes cancelBuildOnDisconnect() using the privileged BUILDER_API_KEY, bypassing the app.build_native permission enforced on POST /build/cancel/:jobId. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Attacker must possess a valid Capgo API key with at least read-only scope and network reachability to the Capgo backend's GET /build/logs/:jobId SSE endpoint, and there must be an active native build job (a known or guessable :jobId) to target. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N) confirms a network-reachable, low-complexity attack requiring only low privileges (a valid read-only API key) and no user interaction; impact is concentrated on availability (VA:H) with limited integrity impact (VI:L) and no confidentiality loss, aligning with the build-cancellation behavior. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker (or disgruntled insider) holding a read-only Capgo API key opens an SSE connection to GET /build/logs/:jobId for an in-progress native build, then immediately drops the TCP connection; the server's abort handler fires cancelBuildOnDisconnect() using BUILDER_API_KEY and aborts the build. Repeated in a loop, this denies the victim team the ability to ship native builds through CI/CD. … |
| Remediation | Upgrade Capgo to version 12.128.2 or later, where the disconnect handler enforces the app.build_native permission against the caller's identity rather than invoking the privileged BUILDER_API_KEY path; details are in the vendor advisory at https://github.com/Cap-go/capgo/security/advisories/GHSA-95g7-xwwx-j737. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify all Capgo deployments and current versions in use; query API audit logs for suspicious build cancellations or repeated disconnections from the GET /build/logs/:jobId endpoint. …
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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