CVE-2026-119566
Description
A flaw was found in Prometheus. This vulnerability allows an attacker who controls a configured remote write endpoint or redirecting server to cause an information disclosure. By returning an HTTP redirect response to an arbitrary host, the server can induce Prometheus into forwarding sensitive authentication bearer tokens used for cloud services. An attacker can capture and replay these leaked credentials to perform unauthorized actions against target backend systems.
Statement
This vulnerability is rated as Moderate severity for Red Hat products because successful exploitation requires specific remote write configurations using cloud bearer authentication and an adversary capable of manipulating HTTP routing or controlling the remote endpoint. In default Red Hat deployments, Prometheus remote write forwarding is not configured or enabled out of the box. Environments that do not export metrics to external infrastructure or that do not utilize cloud-provider bearer tokens are not exposed to this credential exposure.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.8 | N/A | 4.8 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Files or Directories; Read Memory; Read Application Data
Sensitive data may be exposed to attackers.
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