CVE-2026-42151

Name	CVE-2026-42151
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
prometheus (PTS)	bullseye	2.24.1+ds-1	vulnerable
	bookworm	2.42.0+ds-5	vulnerable
	trixie	2.53.3+ds1-2	vulnerable
	forky, sid	2.53.5+ds1-4	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
prometheus	source	(unstable)	(unfixed)

Notes

https://github.com/prometheus/prometheus/security/advisories/GHSA-wg65-39gg-5wfj
https://github.com/prometheus/prometheus/pull/18587
https://github.com/prometheus/prometheus/pull/18590