CVE-2026-83535

Openstack-network-exporter: basic-auth uses plaintext password storage and non-constant-time comparison

Published Oct 12, 2026 CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed
Description
A flaw was found in openstack-network-exporter. When an operator configures user authentication but omits or misconfigures Transport Layer Security (TLS), the basic authentication mechanism is silently bypassed. This fail-open design allows an adjacent network attacker to access sensitive Open vSwitch (OVS) and Open Virtual Network (OVN) dataplane metrics without credentials. Consequently, an attacker can enumerate bridge names, port counters, OVN controller state, and host topology, leading to information disclosure.

Remediation

Vendor Workaround

To mitigate this issue, restrict access to the `openstack-network-exporter` metrics endpoint (TCP port 1981) to trusted networks or localhost. This can be achieved by configuring firewall rules to block external access to port 1981 or by explicitly setting the `HttpListen` configuration to `127.0.0.1:1981` to bind only to the localhost interface. If the `HttpListen` configuration is changed, the `openstack-network-exporter` service may require a restart or reload for the changes to take effect.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Redhat openstack Platform
Vendors & Products Redhat openstack Platform
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A flaw was found in openstack-network-exporter. When an operator configures user authentication but omits or misconfigures Transport Layer Security (TLS), the basic authentication mechanism is silently bypassed. This fail-open design allows an adjacent network attacker to access sensitive Open vSwitch (OVS) and Open Virtual Network (OVN) dataplane metrics without credentials. Consequently, an attacker can enumerate bridge names, port counters, OVN controller state, and host topology, leading to information disclosure.
Title Openstack-network-exporter: basic-auth uses plaintext password storage and non-constant-time comparison
First Time appeared Redhat
Redhat openstack
Weaknesses CWE-208
CPEs cpe:/a:redhat:openstack:18.0
Vendors & Products Redhat
Redhat openstack
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 13, 2026, 4:09 PM
Reserved
Aug 31, 2026, 4:53 PM
Status
Awaiting Analysis
Published
Oct 12, 2026, 7:16 PM
Modified
Oct 15, 2026, 4:33 PM
Severity
Moderate
Public date
Oct 12, 2026, 6:30 PM