Prometheus Azure AD remote write OAuth client secret exposed via config API
CVE-2026-42151 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-42151, released May 4, 2026. It is not reported as exploited. Patch Radar priority: High.
Prometheus is an open-source monitoring system and time series database. Prior to versions 3.5.3 and 3.11.3, the client_secret field in the Azure AD remote write OAuth configuration (storage/remote/azuread) was typed as string instead of Secret. Prometheus redacts fields of type Secret when serving the configuration via the /-/config HTTP API endpoint. Because the field was a plain string, the Azure OAuth client secret was exposed in plaintext to any user or process with access to that endpoint. This issue has been patched in versions 3.5.3 and 3.11.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| flightctl · RHEL 10 | 1.1.3-1.el10em | RHSA-2026:41019 | May 22, 2026 |
| govulncheck-vulndb · opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | OPENSUSE-SU-2026:21483-1 | Jul 30, 2026 |
| opentelemetry-collector · RHEL 10 | 0.152.1-1.el10_0 | RHSA-2026:53413 | Jul 2, 2026 |
| opentelemetry-collector · RHEL 9 | 0:0.152.1-1.el9_8 | RHSA-2026:34359 | Jul 2, 2026 |
| opentelemetry-collector · almalinux 10 | 0.152.1-1.el10_2 | ALSA-2026:34357 | Jul 1, 2026 |
| opentelemetry-collector · almalinux 9 | 0.152.1-1.el9_8 | ALSA-2026:34359 | Jul 1, 2026 |
| opentelemetry-collector · rocky 10 | 0:0.152.1-1.el10_2 | RLSA-2026:34357 | Jul 7, 2026 |
| opentelemetry-collector · rocky 9 | 0:0.152.1-1.el9_8 | RLSA-2026:34359 | Jul 5, 2026 |
| prometheus · Debian 14 | 3.5.3+ds1-1 | DEBIAN-CVE-2026-42151 | May 4, 2026 |
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