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CVE-2026-42945— NGINX ngx_http_rewrite_module vulnerability

Quick assessment

Affected
F5 NGINX Plus
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 NGINX Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_http_rewrite_module模块中rewrite指令后跟rewrite、if或set指令时，可能导致堆缓冲区溢出，导致重启或代码执行。

CVSS 8.1 · High EPSS 3.40% · P88

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.31.0< * unaffected
0.6.27< 1.30.1 affected
F5 NGINX Plus R37< * unaffected
R36< R36 P4 affected
R32< R32 P6 affected
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I. Basic Information for CVE-2026-42945

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_rewrite_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR.  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:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Plus和F5 NGINX Open Source 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX Plus和F5 NGINX Open Source都是美国F5公司的产品。F5 NGINX Plus是一个基于软件的应用程序交付平台。F5 NGINX Open Source是一个高性能Web服务器、反向代理服务器、负载均衡器和API网关。 F5 NGINX Plus和F5 NGINX Open Source存在安全漏洞，该漏洞源于ngx_http_rewrite_module模块中rewrite指令后跟rewrite、if或set指令时，可能导致堆缓冲区溢出，导致重启或代码执行。
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

Vendor Product Affected Versions CPE Subscribe
F5 NGINX Plus R37 ~ * -
F5 NGINX Open Source 0.6.27 ~ 1.30.1 -

II. Public POCs for CVE-2026-42945

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III. Intelligence Information for CVE-2026-42945

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Vendor Advisories for CVE-2026-42945 (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-2026-41217 7.9 HIGH BIG-IP tmsh vulnerability
CVE-2026-41956 7.5 HIGH BIG-IP TMM Vulnerability
CVE-2026-40618 7.5 HIGH BIG-IP SSL/TLS vulnerability
CVE-2026-42920 7.5 HIGH BIG-IP DTLS Vulnerability
CVE-2026-40060 7.5 HIGH BIG-IP Advanced WAF and ASM 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-2026-40423 7.5 HIGH BIG-IP SIP profile vulnerability
CVE-2026-39458 7.5 HIGH BIG-IP DNS Cache vulnerability
CVE-2026-41218 7.5 HIGH BIG-IP PEM iRules vulnerability
CVE-2026-40067 7.5 HIGH BIG-IP APM Vulnerability

Showing top 20 of 51 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: NGINX Plus
Same vendor: F5
Same weakness: CWE-122

V. Comments for CVE-2026-42945

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