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CVE-2026-28753— NGINX ngx_mail_proxy_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存在注入漏洞，该漏洞源于ngx_mail_smtp_module模块对DNS响应中CRLF序列处理不当，可能导致攻击者控制的DNS服务器向SMTP上游请求注入任意标头。

CVSS 3.7 · Low EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1079
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I. Basic Information for CVE-2026-28753

Vulnerability Information
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Vulnerability Title
NGINX ngx_mail_proxy_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_mail_smtp_module module due to the improper handling of CRLF sequences in DNS responses. This allows an attacker-controlled DNS server to inject arbitrary headers into SMTP upstream requests, leading to potential request manipulation. 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:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX Plus和F5 NGINX Open Source 注入漏洞
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存在注入漏洞，该漏洞源于ngx_mail_smtp_module模块对DNS响应中CRLF序列处理不当，可能导致攻击者控制的DNS服务器向SMTP上游请求注入任意标头。
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 1.29.0 ~ 1.29.7 -
F5 NGINX Plus R36 ~ R36 P3 -

II. Public POCs for CVE-2026-28753

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III. Intelligence Information for CVE-2026-28753

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Vendor Advisories for CVE-2026-28753 (1)

Same Patch Batch · F5 · 2026-03-24 · 6 CVEs total

CVE-2026-27654 8.2 HIGH NGINX ngx_http_dav_module vulnerability
CVE-2026-27784 7.8 HIGH NGINX ngx_http_mp4_module vulnerability
CVE-2026-32647 7.8 HIGH NGINX ngx_http_mp4_module vulnerability
CVE-2026-27651 7.5 HIGH NGINX ngx_mail_auth_http_module vulnerability
CVE-2026-28755 5.4 MEDIUM NGINX ngx_stream_ssl_module vulnerability

IV. Related Vulnerabilities

Same product: NGINX Open Source
Same vendor: F5
Same weakness: CWE-93

V. Comments for CVE-2026-28753

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