CVE-2026-39458— BIG-IP DNS Cache vulnerability
Quick assessment
Affected
F5 BIG-IP
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.
F5 BIG-IP是美国F5公司的一款集成了网络流量管理、应用程序安全管理、负载均衡等功能的应用交付平台。 F5 BIG-IP存在缓冲区错误漏洞，该漏洞源于配置了DNS缓存的虚拟服务器上，未公开的流量可能导致TMM终止。
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I. Basic Information for CVE-2026-39458
Vulnerability Information
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Vulnerability Title
BIG-IP DNS Cache vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
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:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用未经初始化的指针
Source: CVE Program / CVE List V5
Vulnerability Title
F5 BIG-IP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 BIG-IP是美国F5公司的一款集成了网络流量管理、应用程序安全管理、负载均衡等功能的应用交付平台。 F5 BIG-IP存在缓冲区错误漏洞，该漏洞源于配置了DNS缓存的虚拟服务器上，未公开的流量可能导致TMM终止。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-39458
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-39458 (1)
Same Patch Batch · F5 · 2026-05-13 · 51 CVEs total
| CVE-2026-41225 | 9.1 CRITICAL | iControl REST vulnerability |
| CVE-2026-41957 | 8.8 HIGH | BIG-IP and BIG-IQ Configuration utility vulnerability |
| CVE-2026-40061 | 8.7 HIGH | iControl REST and tmsh vulnerability |
| CVE-2026-32673 | 8.7 HIGH | BIG-IP scripted monitor vulnerability |
| CVE-2026-34176 | 8.7 HIGH | Knowledge Appliance mode iControl REST vulnerability |
| CVE-2026-42930 | 8.7 HIGH | Appliance mode iControl REST vulnerability |
| CVE-2026-20916 | 8.1 HIGH | BIG-IQ iControl REST vulnerability |
| CVE-2026-42945 | 8.1 HIGH | NGINX ngx_http_rewrite_module vulnerability |
| CVE-2026-41217 | 7.9 HIGH | BIG-IP tmsh vulnerability |
| CVE-2026-41956 | 7.5 HIGH | BIG-IP TMM Vulnerability |
| CVE-2026-40060 | 7.5 HIGH | BIG-IP Advanced WAF and ASM vulnerability |
| CVE-2026-40618 | 7.5 HIGH | BIG-IP SSL/TLS vulnerability |
| CVE-2026-42920 | 7.5 HIGH | BIG-IP DTLS Vulnerability |
| CVE-2026-40629 | 7.5 HIGH | BIG-IP SSL/TLS vulnerability |
| CVE-2026-41227 | 7.5 HIGH | BIG-IP HTTP/2 Layer 7 Dos Protection vulnerability |
| CVE-2026-42409 | 7.5 HIGH | BIG-IP HTTP/2 vulnerability |
| CVE-2026-39455 | 7.5 HIGH | BIG-IP Configuration utility vulnerability |
| CVE-2026-41218 | 7.5 HIGH | BIG-IP PEM iRules vulnerability |
| CVE-2026-40067 | 7.5 HIGH | BIG-IP APM Vulnerability |
| CVE-2026-40423 | 7.5 HIGH | BIG-IP SIP profile vulnerability |
Showing top 20 of 51 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-39458
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