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CVE-2026-48142— NGINX ngx_http_charset_module vulnerability

Quick assessment

Affected
F5 NGINX Open Source
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是美国F5公司的一款高性能Web服务器和反向代理。 F5 Nginx Plus存在缓冲区错误漏洞，该漏洞源于ngx_http_charset_module模块问题，当通过location块提供或代理内容时配置了source_charset utf-8和charset指令（例如charset koi8-r），远程未经身份验证的攻击者可以发送请求，导致NGINX worker进程发生堆缓冲区过度读取，造成有限的内存泄露或重启。以下版本受到影响：NGINX Open Source 1.

CVSS 4.8 · Medium EPSS 0.37% · P29

Possible ATT&CK Techniques 1 AI

T1115 · Clipboard Data

Affected Version Matrix 4

VendorProduct Version RangeStatus
F5 NGINX Open Source 1.13.10< 1.31.2 affected
1.30.0< 1.30.3 affected
F5 NGINX Plus 37.0< 37.0.2.1 affected
R36< R36 P6 affected
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I. Basic Information for CVE-2026-48142

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 content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their 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 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 nginx plus是美国F5公司的一款高性能Web服务器和反向代理。 F5 Nginx Plus存在缓冲区错误漏洞，该漏洞源于ngx_http_charset_module模块问题，当通过location块提供或代理内容时配置了source_charset utf-8和charset指令（例如charset koi8-r），远程未经身份验证的攻击者可以发送请求，导致NGINX worker进程发生堆缓冲区过度读取，造成有限的内存泄露或重启。以下版本受到影响：NGINX Open Source 1.
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 Open Source 1.13.10 ~ 1.31.2 -
F5 NGINX Plus 37.0 ~ 37.0.2.1 -

II. Public POCs for CVE-2026-48142

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III. Intelligence Information for CVE-2026-48142

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Other References for CVE-2026-48142 (1)

Same Patch Batch · F5 · 2026-06-17 · 6 CVEs total

CVE-2026-42530 8.1 HIGH NGINX Open-Source ngx_http_v3_module vulnerability
CVE-2026-42055 8.1 HIGH NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability
CVE-2026-11311 8.1 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-50107 8.1 HIGH NGINX Gateway Fabric vulnerability
CVE-2026-32682 6.5 MEDIUM NGINX Gateway Fabric vulnerability

IV. Related Vulnerabilities

Same product: NGINX Open Source
Same vendor: F5
Same weakness: CWE-125

V. Comments for CVE-2026-48142

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