CVE-2026-56280: Missing Authorization in Cap-go capgo
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.
AI Analysis
Technical Summary
The vulnerability in Cap-go before version 12.128.2 involves the GET /build/logs/:jobId endpoint registering an abort listener on the server-sent events (SSE) stream. When a client disconnects, this listener unconditionally calls cancelBuildOnDisconnect() using the privileged BUILDER_API_KEY, bypassing the app.build_native permission check required by the explicit POST /build/cancel/:jobId endpoint. Consequently, attackers holding only read-only API keys can cancel running native builds, causing repeated disruptions in build operations and CI/CD pipelines.
Potential Impact
Attackers with read-only API keys can cancel running native builds, which disrupts build operations and continuous integration/continuous deployment workflows. This privilege inversion allows unauthorized cancellation of builds, potentially causing denial of service or workflow interruptions in development environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict issuance of read-only API keys to trusted users and monitor usage patterns for suspicious activity related to build cancellations. Avoid exposing the GET /build/logs/:jobId endpoint to untrusted clients if possible.
CVE-2026-56280: Missing Authorization in Cap-go capgo
Description
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.
CVSS v4.0
Score 7.1high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Cap-go before version 12.128.2 involves the GET /build/logs/:jobId endpoint registering an abort listener on the server-sent events (SSE) stream. When a client disconnects, this listener unconditionally calls cancelBuildOnDisconnect() using the privileged BUILDER_API_KEY, bypassing the app.build_native permission check required by the explicit POST /build/cancel/:jobId endpoint. Consequently, attackers holding only read-only API keys can cancel running native builds, causing repeated disruptions in build operations and CI/CD pipelines.
Potential Impact
Attackers with read-only API keys can cancel running native builds, which disrupts build operations and continuous integration/continuous deployment workflows. This privilege inversion allows unauthorized cancellation of builds, potentially causing denial of service or workflow interruptions in development environments.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict issuance of read-only API keys to trusted users and monitor usage patterns for suspicious activity related to build cancellations. Avoid exposing the GET /build/logs/:jobId endpoint to untrusted clients if possible.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-20T01:51:24.919Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a39b29aeed863c81e7e85f2
Added to database: 06/22/2026, 22:09:30 UTC
Last enriched: 06/30/2026, 23:14:44 UTC
Last updated: 08/05/2026, 00:41:15 UTC
Views: 69
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