Bug 2564914

Summary: CVE-2026-119566 alertmanager: Prometheus: Information disclosure via HTTP redirects in remote write requests [epel-9]
Product: [Fedora] Fedora EPEL Reporter: Ronit Dey <rdey>
Component: alertmanagerAssignee: Mikel Olasagasti Uranga <mikel>
Status: ON_QA --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: epel9CC: go-sig, mikel
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["25196e4a-5954-423a-a8be-c008c0f98185"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2563959    

Description Ronit Dey 2026-11-02 10:10:39 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.
Comment 1 Fedora Update System 2026-11-02 21:07:21 UTC 
FEDORA-EPEL-2026-641d74bc90 (alertmanager-0.34.2-1.el9) has been submitted as an update to Fedora EPEL 9.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-641d74bc90
Comment 2 Fedora Update System 2026-11-03 03:13:38 UTC 
FEDORA-EPEL-2026-641d74bc90 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-641d74bc90

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.