---
schema_version: '1.0'
id: security-20260705-774847
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28753
url_hash: 774847652a4cff74cbd87c5155456b71eb2aebc42f2c7c8d75e1925f71aad3ee
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-28753
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-28753
- severity:CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- nginx
- Debian
lang: en
published_at: '2026-03-24T15:16:33Z'
fetched_at: '2026-07-05T15:34:33Z'
updated_at: '2026-07-05T15:34:52Z'
status: published
content_hash: 219d6453d6d372f0f396ed988baf9aea9ef99edc3eb3d8b459f6ea0e9eaeab88
license_note: full
summary: 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 re
summary_source: rss
summary_en: 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 re
entities: []
key_facts: []
related: []
related_auto: []
title: DEBIAN-CVE-2026-28753 — nginx
---

# DEBIAN-CVE-2026-28753 — nginx

## TL;DR
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 re

## Key Points
- cve / DEBIAN-CVE-2026-28753 / severity:CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X / nginx / Debian

## Details
**Severity:** CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
**Advisory:** DEBIAN-CVE-2026-28753

**Affected (your watchlist):**
- `Debian:nginx` 1.22.1-9+deb12u1 → no fixed version listed [proxmox]

**Details:**
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.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-28753

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-28753_

## Source
元記事: [DEBIAN-CVE-2026-28753 — nginx](https://osv.dev/vulnerability/DEBIAN-CVE-2026-28753) — published 2026-03-24T15:16:33Z