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VULNERABILITIES

CVE-2026-28753 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:3.7 LOWVector:CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://my.f5.com/manage/s/article/K000160367 [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-93Improper Neutralization of CRLF Sequences ('CRLF Injection')[email protected]

Affected Products

ProductVersions
f5 nginx plus
r32 p1
r32 p2
r32 p3
r32 p4
r33

CPE

  • cpe:2.3:a:f5:nginx_plus:r32:p1:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r32:p2:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r32:p3:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r32:p4:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r33:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r33:p1:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r33:p2:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r33:p3:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r34:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r34:p1:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r34:p2:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r35:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r35:p1:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r36:*:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r36:p1:*:*:*:*:*:*
  • cpe:2.3:a:f5:nginx_plus:r36:p2:*:*:*:*:*:*

Remediation

  • No remediation found in references.
f5 nginx open source
>= 0.6.27, <= 0.9.7
>= 1.0.0, < 1.28.3
>= 1.29.0, < 1.29.7

CPE

  • cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-28753
NVD Published Date:
Mar 24, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]