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CVE-2026-42934— NGINX ngx_http_charset_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存在缓冲区错误漏洞，该漏洞源于ngx_http_charset_module模块中配置charset、source_charset、charset_map和proxy_pass时，可

CVSS 4.8 · Medium EPSS 0.73% · P53

Affected Version Matrix 5

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.31.0< * unaffected
0.3.50< 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-2026-42934

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_charset_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.  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:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Plus和F5 NGINX Open Source 缓冲区错误漏洞
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存在缓冲区错误漏洞，该漏洞源于ngx_http_charset_module模块中配置charset、source_charset、charset_map和proxy_pass时，可
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 0.3.50 ~ 1.30.1 -

II. Public POCs for CVE-2026-42934

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III. Intelligence Information for CVE-2026-42934

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Vendor Advisories for CVE-2026-42934 (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-2026-40618 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-2026-41956 7.5 HIGH BIG-IP TMM Vulnerability
CVE-2026-40060 7.5 HIGH BIG-IP Advanced WAF and ASM vulnerability
CVE-2026-41218 7.5 HIGH BIG-IP PEM iRules 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-2026-40067 7.5 HIGH BIG-IP APM Vulnerability
CVE-2026-39458 7.5 HIGH BIG-IP DNS Cache vulnerability
CVE-2026-39455 7.5 HIGH BIG-IP Configuration utility 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-125

V. Comments for CVE-2026-42934

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