CVE-2026-56280
HIGH
7.1
CVSS 3.1
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.
Metadata
Severity & Metrics
7.1
HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Affected products (1)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Cap-go | capgo | — | 0 < 12.128.2, 12.128.2 |
Weakness (CWE)
| CWE | Source | Description |
|---|---|---|
| CWE-862 | cna | Missing Authorization |
CVSS scores (2)
| Score | Severity | Version | Source | Vector |
|---|---|---|---|---|
| 7.1 | HIGH | 4.0 | cna | 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 |
| 7.1 | HIGH | 3.1 | cna | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H |
References (2)
- GitHub Security Advisory (GHSA-95g7-xwwx-j737) https://github.com/Cap-go/capgo/security/advisories/GHSA-95g7-xwwx-j737
- VulnCheck Advisory: Cap-go - Privilege Inversion in Build Log Stream via SSE Disconnect https://www.vulncheck.com/advisories/cap-go-privilege-inversion-in-build-log-stream-via-sse-disconnect