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

Quick assessment

Affected
Red Hat Red Hat OpenStack Platform 18.0
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 openstack-network-exporter 中发现了一个漏洞。该组件内部的 HTTP 服务器未配置关键超时参数（例如 ReadHeaderTimeout）。此漏洞允许未经身份验证的远程攻击者发起多个缓慢的 HTTP 头部连接。攻击者通过逐字节地传输头部信息，可以耗尽服务器资源，特别是文件描述符，从而导致拒绝服务（DoS）攻击，使合法的 Prometheus 指标抓取和告警功能无法正常运行。

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat OpenStack Platform 18.0 any affected
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I. Basic Information for CVE-2026-83536

Vulnerability Information
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Vulnerability Title
Openstack-network-exporter: http.server has no readheadertimeout / readtimeout (slowloris)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenStack Platform 18.0 - cpe:/a:redhat:openstack:18.0

II. Public POCs for CVE-2026-83536

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III. Intelligence Information for CVE-2026-83536

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Vendor Advisories for CVE-2026-83536 (2)

Same Patch Batch · Red Hat · 2026-10-12 · 12 CVEs total

CVE-2026-87744 9.1 CRITICAL Io.quarkus:quarkus-hibernate-orm-rest-data-panache: missing authorization in quarkus rest
CVE-2026-108094 7.8 HIGH Mutter: mutter: client-triggered use-after-free in wayland color-management icc image desc
CVE-2026-75888 7.7 HIGH Openshift/console: openshift/console: authenticated ssrf via helm chart url fetch
CVE-2026-83535 7.4 HIGH Openstack-network-exporter: basic-auth uses plaintext password storage and non-constant-ti
CVE-2026-109082 6.8 MEDIUM Keycloak-services: keycloak-services: ciba confidential-only contract not enforced for pub
CVE-2026-94451 6.5 MEDIUM Quarkus-hibernate-orm-rest-data-panache: quarkus-hibernate-orm-rest-data-panache: informat
CVE-2026-107193 6.5 MEDIUM Foreman: api filter lookup ignores a search-limited filter permission
CVE-2026-85471 6.4 MEDIUM Quay: quay: webhook notification ssrf -- hostname-string blocklist trivially bypassable
CVE-2026-109194 6.4 MEDIUM Quay: build trigger uuid idor in quay api
CVE-2026-107203 5.4 MEDIUM Foreman: domain and subnet interface api skips host search filters
CVE-2026-109195 3.1 LOW Quay: repository auto-prune policy uuid idor in quay api

IV. Related Vulnerabilities

Same product: Red Hat OpenStack Platform 18.0
Same vendor: Red Hat
Same weakness: CWE-400

V. Comments for CVE-2026-83536

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