CVE-2026-83536 Openstack-network-exporter: http.server has no readheadertimeout / readtimeout (slowloris)
An unauthenticated remote attacker can cause a Denial of Service in OpenStack network exporter by exhausting server resources via slow HTTP connections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-83536?
CVE-2026-83536 is a medium-severity denial of service vulnerability in Red Hat OpenStack Platform 18.0, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2026-83536?
How do I fix CVE-2026-83536?
No fix has been published for CVE-2026-83536 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-83536 being exploited?
There is no known exploitation of CVE-2026-83536 in the wild and no public exploit code.
Sources
Also known as GHSA-qphq-4x45-237m.