CVE-2026-119566

Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects

CVE-2026-119566 is fixed in golang-github-prometheus-common on 1 platform by DEBIAN-CVE-2026-119566 (version 0.69.0-1), released November 1, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

4.8

Moderate

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0020

10th percentile

Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to capture Azure AD or Google IAM bearer tokens by redirecting remote_write requests to another host. Attackers controlling the remote-write endpoint or a redirecting server can return a 3xx to their host and replay the token, for example to write metrics to the victim's backend.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
golang-github-prometheus-common · Debian 14	0.69.0-1	DEBIAN-CVE-2026-119566	Nov 1, 2026

Details

Published
October 30, 2026
Weakness
Insufficiently Protected Credentials
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119566

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