Vulnerability · Published Oct 12, 2026 · Assigned by redhat

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

Medium 5.3

In plain English

A medium-severity uncontrolled resource consumption in Red Hat OpenStack Platform 18.0 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 75.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat OpenStack Platform 18.0	see references

Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

https://access.redhat.com/security/cve/CVE-2026-83536 vdb-entry, x_refsource_REDHAT
RHBZ#2526401 issue-tracking, x_refsource_REDHAT