Medium · CVSS 5.3CVE-2026-83536

Openstack-network-exporter: http.server has no readheadertimeout / readtimeout (slowloris)CVE-2026-83536

Answer in brief

CVE-2026-83536 records a Medium severity (CVSS 5.3) vulnerability in Openstack-network-exporter: http.server has no readheadertimeout / readtimeout (slowloris). The current sources do not mark it as known exploited. The current feed maps Red Hat/rhoso-operators/openstack-network-exporter-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 12, 2026Updated Oct 12, 2026Source checked Oct 12, 2026First seen by HOL Oct 12, 2026Material review Oct 12, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/rhoso-operators/openstack-network-exporter-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Red Hat/rhoso-operators/openstack-network-exporter-rhel9generic	*	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Red Hat/rhoso-operators/openstack-network-exporter-rhel9.
Review the reported fix. Source-reported workaround: Restrict network access to the `openstack-network-exporter` service. Configure firewall rules to limit incoming connections to port 1981 (the default port for the exporter) only from trusted hosts or networks that require access for Prometheus scraping. This will reduce the attack surface by preventing unauthenticated adjacent attackers from reaching the service. Applying firewall rules may require restarting network services or the firewall daemon to take effect.

Evidence timeline and material changes

Published upstream
Oct 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 12, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 12, 2026

Sources and claim methodology

Upstream source description

A flaw was found in openstack-network-exporter. The HTTP server within the component is configured without essential timeout settings, such as ReadHeaderTimeout. This vulnerability allows an unauthenticated, remote attacker to initiate multiple slow HTTP header connections. By trickling header bytes, the attacker can exhaust server resources, specifically file descriptors, leading to a Denial of Service (DoS) that prevents legitimate Prometheus metric scraping and alerting.

Quoted source text, attributed separately from HOL analysis.