---
schema_version: '1.0'
id: security-20260719-649a91
url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-56434
url_hash: 649a91e06121337147075bdd9d37e19fc8e125d8d4ed69430fac13027c5c58c2
canonical_url: https://osv.dev/vulnerability/DEBIAN-CVE-2026-56434
source: osv:debian
category: security/os
category_raw: cve/os
region: null
tags:
- cve
- DEBIAN-CVE-2026-56434
- severity:CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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: '2026-07-15T15:16:45Z'
fetched_at: '2026-07-19T06:51:51.719609Z'
updated_at: '2026-07-19T06:52:16Z'
status: published
content_hash: cf05e6fbe6a88c27db225dbb9e2898935fb94a7bc127fd6510de48fb4647ed61
content_changed_at: null
license_note: full
summary: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module.
  This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and
  proxy_buffering off directives are configured. With this configuration, an unauthenticated
  attacker with man-
summary_source: rss
summary_en: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module.
  This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and
  proxy_buffering off directives are configured. With this configuration, an unauthenticated
  attacker with man-
entities:
- name: CVE
  type: concept
key_facts: []
related: []
related_auto:
- name: MCP_Python_SDK
  type: content
  weight: 2.0
title: DEBIAN-CVE-2026-56434 — nginx
---

# DEBIAN-CVE-2026-56434 — nginx

## TL;DR
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-

## Key Points
- cve / DEBIAN-CVE-2026-56434 / severity:CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/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-2026-56434

**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_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process.  Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

**References:**
- https://security-tracker.debian.org/tracker/CVE-2026-56434

_Data: OSV.dev (upstream: debian) — https://osv.dev/vulnerability/DEBIAN-CVE-2026-56434_

## Source
元記事: [DEBIAN-CVE-2026-56434 — nginx](https://osv.dev/vulnerability/DEBIAN-CVE-2026-56434) — published 2026-07-15T15:16:45Z