CVE-2026-28753— NGINX ngx_mail_proxy_module vulnerability
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://my.f5.com/manage/s/article/K000160367vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-28753
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 weakness: CWE-93
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Netty vulnerable to HTTP request smuggling and RTSP request - CVE-2026-39849
Pi-hole FTL remote code execution via newline injection in d - CVE-2026-34458
Sandboxie-Plus privilege escalation via INI CRLF injection b
V. Comments for CVE-2026-28753
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